Is it such a huge killer outside gaming benchmarks? And even then, the extra power is useful only if you jumped on the 4K bandwagon.
Personally, consider the amount of random crap that i run, I'd rather have more cores. And more importantly, 80% of the performance for 50% of the price is just fine(tm).
The gaming benchmarks are a bit meh since in most realistic builds the GPU will be the bottleneck, not the CPU (unless you buy a 1080Ti with a Ryzen 3 or i3, though in that case all help is lost).
More cores do benefit if you run stuff besides the game, which most people do.
I'm into VM abuse, so for me more cores would be a no brainer...
Sadly for AMD that would be IF i needed a new machine. My 2012 Core i7 still seems to be enough for my needs. (Except the GPU, that I changed recently.)
At this time the only reason I'd upgrade would be to go from 32 G ram to 64. 32 is barely enough if i happen to need a couple VMs up and the usual 100 tabs of docs in the browser :(