Holding a point and applying SF to project

Never seen a problem either. Going on 35 years now using that system.

I try to remember 2 pearls my dear friend, mentor, & former business partner Forrest said to a new hire one day.

"DOT is DOT, but the rest of the world, its mostly not."

"Datums are like a box of chocolates, you never know what you're gonna get, & thats all I have to say about that."

I'm not going to say the ground coordinates are "wrong".
They are typically "close enough".
What is true however, is that if you are laying out everything with the same "wrong" coordinates then everything laid out will will properly fit together.
That's the important thing.
If a bridge is (CF 0.99991234 * length) too short, it makes no difference.