That makes sense. If it works reliably why change it. I may be wrong, but ive seen that most PCs that drive special purpose devices usually run software ranging from 'not new' to 'old AF'. e.g.

-Saw a piece of military tech once, radar kind of shit. It was running some windows older than WinXP, can't remember exactly but it was windows 2000 iirc. (I don't live in the us btw. This was in 2017)

-My father worked at a cement sheet factory back in 2004-5. There was a weighing bridge over there and the system that handled that ran Windows 95 when all the office computers ran XP. (My own computer ran Windows 98)

-Saw a post on r/justrolledintotheshop where the guy posted his alignment system. It was using a program called Aladin 3 Aligner. Now I can't find info about that software, apparently it comes bundled with hardware but OP said it was old and it looked the part.

I guess the approach towards specialized equipment is 'why fix something that ain't broken?' While in most other places they want to keep patching bugs, security issues and make things better.

Honestly, if Windows works better and is easier to work with, just use it. Why waste time and resources making something that will do the same thing?