I mean just looking at Elden Ring here:

• The engine was apparently optimized for stutters on PC, not the actual game.
• Keybinds were incomplete, and you couldn't even rebind the ones that were doable properly because of the fixed nature of some keys. (An incredibly common problem for so many games)
• Lots of auto-combo keys (where one key does a lot of things instead of using all the buttons available), too.
• Mouse acceleration completely broken, and they never fixed that. Mods can somewhat rectify it, granted.
• The re-auth to the online server makes sense from the way a console handles launching/closing games, but not for a PC. Makes going back out for settings (since at launch a lot could not be changed mid-game) really fun. 😑
• The UI makes no use of the keyboard or mouse, and in fact seems to actively hate them.

All of these would be trivial except maybe the stuttering if they had developers that regularly do PC games. They're just part of basic development or basic UX evaluation.