I'm not saying 9th and 10 gen users don't exist. I'm saying 9th and 10th gen users that have a GPU at a 4070 level or higher are likely an extremely niche portion of the market.
You're not paying attention to what I'm saying. I don't think there is anything wrong with a person using a 4090 buying a 9800X3D. If you want the best and the rest of your system is already maxed, go for it. What I'm saying is that if you don't have a 4090, there is no logical reason to go for a 9800X3D outside of fringe situations. A 14700k is $150 to $200 cheaper than a 7800X3D right now, despite only being 2.5% slower at 1440p. You're not going to future proof anything buying the 7800X3D. In 4 years when 1440p is maybe similar to 1080p today, the difference between the 14700k and 7800X3D will increase to maybe 5% which is the difference at 1080p between those 2 today. Does spending an extra $150 to $200 today make sense to get 63fps in 4 years vs 60 fps with a GPU equivalent to a 4090? I'd argue, no. That money is better not spent and put towards a better upgrade in the future.
You don’t get my point either man, the future proofing is two fold, firstly when the gpu isn’t the bottleneck anymore, the 9800X3D is like up to 30% faster than a 14700k, so in 4 years time, it’s less likely to bottleneck the 6070 or above at 1080 or 1440. So getting it instead of the EOL RPL did give you the option to not cpu bottlenecking for a generation if not more.
Plus with the X3Ds now being popular in the gaming community, you can’t guarantee if the game devs will lean more to coding it in. A more cache sensitive way than before, so that’s also a bonus.
Second future proofing is that AM5 platform is more likely to have 1-2 more generations of life in it. Just like how the 5800X3D is still available to be purchased now. In 3-4 years time you still have an option to spend much less to only get a new am5 cpu if you want, but you can’t do so on LGA1700 except gambling the 14900k available on second hand isn’t degraded.
Future proofing is just that maximising your system’s potential useful life for a few more years down the road, that’s also why some ppl just buy the high end n stuffs, for current softwares there is usually no reason to go past i5 and 70 class gpu, but getting the higher end could make it last longer before you need a complete overhaul of your systems.