They don’t have to. I have a 7950x3d and don’t use gamebar. It’s all right there in the bios. You select “Cache” for your CPPC and it will run on the V-cache cores with preference, but not restricted to.
It has a lot more per core L3 cache as well. In fact it has the most per core
Wrong
Not needed
Might know a thingy or two. This thread has a lot of info. 7950x3d Benchmarks for MSFS 2020 - #931 by MrTonySM