I'm going to say this right now
Tommy - that would thin out the ranks considerably in my State...
Most probably these things happen because the C3d parcel or line label style in use is set that way. It is evidence of poor CAD work, quality control, & quality assurance, but not an intentional thing.
Courtesy of one of the great sages of the 20th Century: “Stupid is as stupid does.” – Forrest Gump
A few years ago I was asked to review a preliminary plat being prepared for a nearby city. The first red flag was noticing that every bearing had arc-seconds to five decimal places, e.g. 47.12345" This was on block lines in a small subdivision. As I recall I figured a line would have to be roughly 50 miles long before the difference between 47.12345 and 47.12346 would be a quarter of an inch. Forget curvature of the Earth and all sorts of other things. BTW, the plat was provided to me by the city, so obviously the surveyor didn't see anything wrong with such crap.
Not sure what the problem is with over precision of units? So what if he computed out to 10 decimal places? You just round it off to whatever decimal places your instrument is capable of laying out right? Problem solved, you get paid, on to the next client/