this is why having a damn machinist on site makes sense, he has enough knowledge to know what will happen and you know enough about it that you basically tell him what needs to be precise, then you don't even need tolerances because it makes sense. This means that the process is too faceless
too remote, teams too small, etc leads to this problem. its not gonna be fixed by a few youtube videos and rants, I doubt even education will fix it, its just a result of consolidation and cost optimization on work structures. tough shit. this happens because of like administrative policies on team makeup, the idea that you can cordon off all the machinists and trade workers/artisans to cost optimized 'islands' that communicate to the outside world via simple no effort paper work to reduce costs results in this problem.
things like
1) i dont wanna buy a three phase and equipment
2) i dont want to deal with osha
3) i dont want to hire someone on site
4) eww blue collar people