If you look through some of the technical stuff WRT to them,there is a lot of custom stuff,which aims to reduce the load on the CPU,to free up resources. The OS overhead is lower too. What do you expect - a PC is a general purpose device,whereas a console is a device dedicated to do one or two things. You have to appreciate a PC needs to brute stuff more,with those six cores,you are running the OS,AV and various other stuff such as audio processing,etc. Most reviews are looking at very clean OS installs with nothing running in the background.
If you are the sort of person who upgrades every few years you might be able upgrade to more cores at the appropriate time. OTH,if you intend to be keeping the PC for sometime you realistically need to be looking for an 8C/12C CPU IMHO. Remember when only a few years ago people were saying a Core i5 7600K 4C/4T CPU was fine - is it really fine now?? Its moved from 4C/4T being a sweetspot to 6C/12T in two,maybe three years. That was with the previous generation of consoles.