I'll not be keeping my 11900k setup for anywhere near as long as I kept my 6700k setup. I've landed a nice promotion at work a few months back, so more disposable income to play with fun toys
I'll not regret my purchase, as it'll do everything I require of it. I'm only really upgrading as my 6700k heavily bottlenecks modern games, where 4C8T just aren't enough. Cyberpunk, Shadow of the Tomb Raider, are examples of games where I literally get drops to 20-30 FPS (from an average of > 80-100 depending on the scene). CPU usage during these spikes is 100% across all cores.
I game at 4k on a CX48 OLED where the GPU is the bottleneck (as long as you have more than 4 cores lol!) , so I'd not notice whether I had a 5950X, 11900k or 9900k, as they all have > 4 cores.
4 m.2 slots on the Maximus Hero XIII is also a feature I specifically wanted - no more SATA cables, means several 2TB SSD's is sufficient for my storage requirements, for anything I don't keep on my NAS.