I really just want a "cost is no object" approach to a console. Legitimately high-end specs and great build quality. I know that, at the end of the day, it's up to devs to optimize their games appropriately, but it'd be nice to have hardware that essentially gives me modern PC-like performance, but without the hiccups that PC gaming so often brings with it these days.
Sounds like me a couple years ago. You should choose a budget and ask people here for advice on parts to build your own ultimate PC. Used to be console-only but I have two different PC builds now, desk and living room, and two Steam Deck. No hiccups anywhere, works so well now that I avoid buying anything on console even though I have all consoles.
The downsides for me as a long time console gamer is:
1. the occasions when I need a keyboard. It’s rare but when it happens it’s annoying.
2. using anything other than Steam in a couch setup. Nobody else does big screen modes so you’ll sit there with a keyboard again grumpy like me.
Just go with Steam on everything is my advice, and big screen mode. Means it’s very similar to having a console.
Could try out Playnite if you want to try a multi-store menu, not perfect but some like it.