This really depends on what you're playing. I used to use a pc built in 2013 with the then latest-and-greatest, but it did really stop being viable in my games

This really depends on what you're playing. I used to use a pc built in 2013 with the then latest-and-greatest, but it did really stop being viable in my games ~early 2022 when they had some updates and four haswell cores just weren't enough anymore. Upgraded to 12th gen intel at that time and quadrupled my fps. (Notably cpu-bound games) Games that are less demanding can be fine, but if you're playing something where frames matter might be harder to play.