Respectfully disagree, it's the performance increase for stuff that you actually do that matters. For me 2080ti to 3090 was a decent bump.
I agree and that's how I normally update my hardware, I look at it that way and is it worth the upgrade, normally the two things I look for are does it make more work faster and does it allow me to work with larger data sets (for the GPU as VRAM has become very important for my work). For gaming there really is only one game I care about it getting faster or allows me to use higher settings is Microsoft Flight Simulator, from the old ones to the latest MSF2020. Most other games will also get an uplift of course but like I said above I look at that as what is the average increase over each generation.
See I came from a intel 5930k and 980ti to 5950x and 2 x 3090 Nvlink-ed with the last upgrade I did last year, I did buy a 2080ti when they came out with the kingpin and well it got sent back the same day as I didn't think it was worth the price at the time as wasn't enough of an update to be worth my time for my home system and borrowed a RTX Titan from work to do my work at home while stuck at home due to covid lockdowns, but that had to go back when the office started to open up as it came out of a workstation with 2 of them in and needed 2 of them to do the work on.
I don't plan on updating this system now for at least 5 years and this is why I say updates every generation are pointless and have been for many years, I remember the days we got real jumps in performance not 20-30% from your previous gpu purchase, I remember reviews would say not worth buying if the new gpu wasn't double the performance of the previous gen, now most reviewers AKA shills praise these minor updates every generation as some miracle. This is also why these gpu companies are taking customers for a ride now, with huge price increases and now silly power use.. Next gen is going to be comical at this rate, price and power use for another 20-30% AVERAGE performance increase.