A lot of engineers only get to work on one small aspect of a system not seeing the whole picture e.g. one person designing the engine and one the engine compartment. They often have envelope dimensions but not the actual parts/models.
This sometimes explains why some things are a bear to work on anymore. Also since maintenance procedures often aren't written till after a product is designed/built they include things like "pull engine to access #8 spark plug"
I'm not condoning this, just stating facts/opinions.
As far as your fit example I call it CADD cancer, and hate it. Just because a computer program defaults to four decimal places .0001" does not mean it needs to be that exact. There is a fine art to understanding fit and finish....
If a saw cut will do why machine and grind to a tenthousanths of an inch.... why because the drawing said 4.3125. That's why to this day I use fractional dimensions where ever possible. It shows the machine shop that it's just not that critical. But I too have made some boneheaded 3/4" pin 1/2" hole mistakes... It happens, but I'll be the first to admit fault and let everybody have a good laugh.
I had an intern once say something that I'm still quoting.
He said "Boy it sure does get expensive when you put it in steel.
He hit the nail on the head... paper's cheap... it gets expensive when you put it in steel!
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