Arma 3 is aparently a 2 core process and a 5+ year old game. A terribly outdated benchmark.
New games, and particularly elite can utilize all 12 threads of my i7 8700k and AMD ryzen owners say the same if you don't have a thread count at the ready, something needs to wait.
And with vr that waiting means dropped frames, and dropped frames make you sick.
My i7 4790k couldnt keep up with the demands of vr, you might love your aging i5, but at this point it is no more than a functional security blanket.
Practically all games these days can use 8 threads or more from a CPU.
Windows is also highly capable now to load balance over cores, so if you have more, windows can load other process on them.
So anyone who says to prioritize single core speed over multicore are just plain wrong and half a decade behind the times.
Over the past year I have been digging into it, and honestly for the past two years gaming has been moving towards truly multithreaded from the old adage of "gaming is a single core anyways, best CPU for gaming is the i5" hasn't been true since then.
Also keep in mind that AMD pretty much was so far behind for so long up until the release of Ryzen.