I will counter with the Iiyama prolite x4071uhsu-b1, the highest-contrast (5000:1 typ) LCD I have ever seen with such a competitive sticker price. 500~600$ 4k 40". Up to 75Hz @24bit color or 60Hz @40bit color.
It has zero smart stuff, and comes with an RS232 input for which documentation exists to control _everything_ remotely. I think the latter is due to it's brother being a 24/7 rated digital signage device, which typically implies remote management.
I'm passively looking for a newer model for a potential secondary setup on a different desk/location, but haven't stumbled on anything I'd prefer.