Ah, I did pay someone to do the millwork and trim work. You need a very accurate miter saw and a lot of experience to make perfect niters. I’m getting there but I still get off by a 1/16tb” to a 1/32nd” often.
The finish work is the final last guy. The guy that did our trim would randomly yell out swear words every 20 minutes. His life is hard. And he was expensive.
Unless a 3d printer or CNC machine is responsible for the accuracy you better count me out.