This should be a nice upgrade for my 9600k. Many people in the tech-bubble like to nitpick about CPUs and dismiss the "not the most expensive CPU in a family" as entry-level trash, but honestly, I don't see a reason to go higher than xx400 since the 10400 unless you need raw CPU performance locally. I have a "cheap and crappy" not even really overclocked 9600k, which I downgraded from the 9700k, paired with a 3080. For general usage it's more than enough; for games, at 2160p the GPU is the limiting factor, at lower resolutions even if CPU bottlenecked, I'm still well above the screen 120Hz refresh rate. If I need a lot of CPU power I use computers at work remotely.
If Intel makes 12400 with whatever iGPU, that's my sweet spot since I know I will need an iGPU down the line, probably after the next upgrade.