I've been with the same platform since about 2015, save for GPU and disk upgrades. i7 4790k and a 6600XT, about 16 TB of slow storage and 3 TB of faster stuff. Running Pop for about a year, because my girlfriend and I share the PC (it's a living room TV PC).
Tbh, I'm still really happy with it, though I've been eyeing a mobo/CPU/RAM upgrade. With the games I play I haven't felt the 4790k too much --occasionaly a tweak here and there, but at 1080p and with the games I play, the GPU always gets most of the load.
My (non-work) laptop is running Arch and Hyprland. Kind of love it so considering a general switch with the impending upgrade.
If it's affordable for you, I would say take a look at the NUC Extreme kits for a living-room PC upgrade. Custom small form-factor that was designed for standard GPU sizes (check the dimensions carefully - my Sapphire 6700XT fit the specs but was still a tight fit), and it's fairly quiet even with graphics settings set up to high.
My wife has been happily playing her games in the living room this past week, and I've been able to sneak a few hours in between.
Thanks for this suggestion. Even though it's a living room PC, I don't really have a small form factor requirement -- the machine itself sits in a rackmount behind the wall behind the TV. Thanks to that it also pulls double duty as a regular PC in the next room over, though I use it less over there. But I'm planning to upgrade with a full size ATX mobo.