The future proofing bit always make me laugh
It didn't even occur to me when getting 4090 - it was more of a "I've not had xx90 series of GPU before"
But it paid for itself, so I don't feel bad about it at all and it's still a very strong GPU for games. Still, I don't think I'll repeat that in the future, one time is enough, and I would likely be fine with xx70 series considering most new AAA games have looks but not the soul to bother. I find much more fun in indie titles these days, which also have much less system requirements.