I understand this and I agree, but I also have a sort-of opposite perspective. I think humans turn games into efficiency-obsessed slaughterfests. If you want to observe the artistic qualities of a game, and really "get into the world" of it and pretend to be part of a story, part of another world, and really put yourself "in-character" and truly experience all the aspects of a game while remaining true to the world and your character, then playing with other humans is sure to burst that bubble very quickly and with sudden pain - unless they all agree to be in-character, which is pretty much non-existent in games anymore except an occasional MUD. Humans, when playing with other humans, tend to ignore everything that doesn't further their goal of getting "points/frags/kills/levels" by any means, and the game loses any other point to it - it turns into just a random collection of pixels that people use to efficiently "pawn" someone else's collection of pixels, what those pixels are or are meant to represent becomes completely irrelevant. So any and all "exploits" and "tricks" that help you pawn someone are used, the game is literally ripped apart into its bare essentials, becoming a "tool".
I guess it's like movie vs a hammer. Movie is there to look a certain way and who/what is being represented matters (whether it is a troll army or tony soprano, etc), a hammer is there to do the job right, nobody cares what it looks like, even if it looks like tony soprano. But games are both - but humans tend to turn them into the most efficient hammers possible tend to ignore everything else. So if you're playing a Lord of the Rings strategy game, in single player you can pretend to be Sauron all you want, you can make your own story. In multiplayer you have no time to stop and enjoy the action and pretend to be Sauron. You're either a super-efficient mass-killing machine that knows to put "this building first, then this, then this here, then build 100 of these guys, then a few vehicles here, then rush them" or some other strategy, or you're dead. So it becomes purely about strategy - which buildings/units to build, in what order, and where - any sense of being Sauron or even what the game is about at all is completely irrelevant. It's all about unit strengths, numbers, and what "works" and what doesn't. And in that sense, we're seeing the game and acting more like a computer I think, who can only see numbers and strategies - and has no way to enjoy "playing as Sauron" and having any care/sense of what that means etc.
And I don't mean just role playing, I mean FPS or strategy or any genre of games. You cannot replace a human with a computer in some sense, a human is a human - it's a real being with real feelings and thoughts and much greater scope of strategy and unpredictability, there is an element of humor and just a sense of "togetherness" with other people, it does add a certain quality to what otherwise is basically a decorated calculator, a set of "IF..Then..Else" statements and nothing else. But while humans add the human quality, they do tend to ignore the game experience completely and make their destruction of others as efficient as possible, caring not for realism or anything else but what they can do to further their goal. But probably that's why they include single player and multiplayer. Single player is to enjoy the game world, the story, and to act in-character etc. Multiplayer is to get your tuchus handed to you in those efficiency-obsessed slaughterfests. When you first witness a rocket jump, or bunny hopping, or any other techniques to run/fly around in circles around you and shoot you, that's when you realize you're not in Kansas anymore, that the single-player world you've been playing in and the multi-player world are 2 different worlds entirely.
Thinking philosophically about it though, in real life there are basically 3 things you can seek. 1 of them is missing in games, leaving only the other 2. The 3 things being: 1) the "fakeness" that includes culture, beliefs, pretty shiny things, and other "A" influences. 2) Nothing but domination of others, being a total psychopath - exploiting reality to get an edge at any cost. 3) A higher meaning to life, the "B" influences. In games there is no higher meaning. That leaves only 1 and 2 - either you're just a "let's pawn everything that moves", or you enjoy the pretentious nonsense like the imaginary world the game is meant to represent. I guess if you have to pick, the former is the only real alternative - to use every possible means, to push the game to its limits and beyond together with others. Cuz the former is pretentious all the way, nothing about it is real - not just the fake world and story, but also the fake limitations that you'd have to pretend and obide by that don't really exist (meaning, all those flaws/exploits/tricks that you can use like rocket jumping etc, you'd pretend aren't there to pretend to be part of a pretend world). Nothing here is real at all. So the only real and realistic alternative is the one where you just kick ass - where you use the game's every intended and unintended "feature" to pawn/win. It actually brings you closer to reality - you really see what the games TRUE limitations are (and what they are not), you see what your TRUE limitations in a game are, and you see what other people can truly do. It brings it back to reality somehow. Cuz then when you're honed your multiplayer skills and go back to single player, you're literally God over the pretentious/simple/predictable/weak computers, you know how to use the game like the computer written by the game's designers never dreamed - cuz it doesn't dream, doesn't improvise, doesn't push its own limitations further out. Hmm did I just counter my entire point about the fun of enjoying the game world as it was intended? Probably... role playing does have its charms, but it can get pretty boring after a while.
Addendum: And I don't necessarily mean to put "pawning others" as your highest goal. But just being as good as you can get, to use the game as a tool, bending any rules that are possible, ignoring the story/prettyness/character roles etc. So in a sense winning does become the highest goal, but not in the sense of rendering you impersonable or "touchy" or irritable or overly competitive. You can compete but enjoy the company of others - cuz you're only competing in the game, not in the sense of an ego trip per se, or to "prove" to others how much "better" you are etc. Just not to sacrifice your potential skill in a game by succumbing to artificial limitations that the story/setting seeks to impose, that's all.