I wouldn’t be so sure of that. People at different times in history frequently seem to have been able to do things in amounts of time that seem “unbelievable“ to us, from our viewpoint today. There are many possible (down to earth) reasons for that.
1: There was less bureaucracy/regulations/rules/paperwork,
2: People were sometimes motivated and eager to do/build things with a passionate drive that is often lacking nowadays (out of religious passion for example),
3: workers attitude and rights were different,
4: Sometimes huge amounts of people were assigned to build something,
5: When your and your families life REALLY depend on you doing the job, the general motivation standard of the average worker was probably quite different from today,
6: People in the past seem to have been physically very strong and enduring compared to us, maybe because, generally speaking, life circumstances were quite a bit harder then today,
Also, we can see similar phenomena today:
- People who are doing a job from an early age, for many years, develop strengths, abilities and expertise in that field of work, that seem unbelievable to someone not having had that training/experience/experience
- Western people are frequently amazed how people in the east can build/organize/finish large scale projects in a matter of days/weeks/months. Projects that would take the average western country years and even decades to finish. Examples of that are the large scale hospitals the Chinese build in a matter of days at the beginning of Covid or the Japanese rebuilding a complete intersection over night, after it collapsed into a sinkhole.