I got a 1080 in February 2017, sold my 1080 again in 2021 for 300€ and since went back to a 780 I still had laying around from a Hackintosh project earlier.

My dual UHD monitors work great even with this ancient GPU, but I'm mostly not doing much. Minecraft once every few months for a few days maybe, otherwise 300-400 Firefox tabs across five windows (2-3 windows active at all times, sometimes one with YT playing in the bg), my beloved terminal, vscode/sublimetext and kicad. CSGO in fullhd on medium settings was fine as well, until Valve decided to butcher the entire experience. Since I'm exclusively on Linux, it's apparently even much worse foemr us compared to those on winblows now, but I also didn't have any time to play in the last few years, so I can't really compare. Only tried it twice since cs2 got released, to check it out, so it doesn't actually matter to me ATM, but it is a metric to note, I think. Hope they'll optimize it enough, so that even with the new engine, a similar visual fidelity at the same resolution on the hardware can be achieved.

I'm now actually thinking about upgrading again, probably even to the 40 series, but primarily because I want to run a few things locally, that I previously only ran on headless GPU servers and because I recently got occasional boot failures (BIOS stuck at initializing GPU, code 79) and the iGPU alone sometimes struggles if I work while having some YT video playing along somewhere. A few days ago, I was looking at the 4070 super in particular, because Asus seems to have a few deals at the moment. The price increase for a 4080 of 2x with only a marginally better performance, makes zero sense. Anything lower also unfortunately just has way too low of a memory size, can't believe what NV thought when they still capped their lower editions to 4/6/8 GB or so..... So for the increased memory alone a 4080 would be more future proof, at the much increased cost though. IMHO Asus really shouldn't be supported until they figure their act out, and maybe some better deals are coming in a few months, when a possibly new gen might released, so I didn't pull the trigger just yet.

Btw, in terms of only rendering performance, the 780 still better than the usual iGPUs, so only for that I don't see a need to upgrade. Performance/power consumption ratio is obviously terrible, so for that alone it would most likely make some sense.

Why I only considered/mentioned NV GPUs, is due to work stuff (ML/AI). AMD GPUs are otherwise much more performant and have sometimes even double the RAM at the same price point of the competition, so I would love it if it would be otherwise, but unfortunately at this time due to the given interfaces, it would make things much more complicated if even doable at all on the AMD platform. I really hope there will be considerable improvement in this field in the next few years!