I did a lot of extra research and decided to reconsider. I am about to replace my old i5-6600k with 5600x.
Reasons:
I've managed to get RTX 3060 Ti FE, 5600x and B550I motherboard at MSRP, which is a good value;
B550 has proper support for PCI-Express 4.0, which does nothing for RTX 30xx, but...