Here's the problem with that logic...it's not just them. The same HDMI port that lets people hook a gaming PC and/or game console to the display also lets the home Mac user hook his work PC to it if he brings work home. It's true there probably aren't many people using an Apple Studio Display as a primary gaming display with a console or Windows-based gaming PC. It's also true there are people with both a Windows PC and a Mac. It's not uncommon on MacRumors to see posts asking about KVM switches, and some of those requests are from dual platform users.The market for displays that can easily connect to both Macs and gaming PCs/game consoles on the same desk is VANISHINGLY small, yet the nerds on these forums act like it's some egregious error on Apple's part not to emphasize it. Ignoring this irrelevant user group is intentional.
It's also true that people who make the painful splurge to get an ASD may wish to wring maximum usage out of it.
I don't dispute it's probably a minority fraction of users; I'm just saying the number of people who'd benefit from a latest generation HDMI port, for example, probably isn't vanishingly small. It would be interesting to know a %, though!