This is just proving the OPs point. I have a PC from around 2013 with a 970, and I can still play all the games I'm interested in just fine (BG3, AW2, etc). If you absolutely need 4k 120fps at ultra in order to have fun, that's on you.
If you want to play at 15 fps go ahead. I never never said you needed 120fps. Only that the comment about performance is bullshit. The vast majority of gamers would laugh you out of the room.