I suspect 4C/8T is enough.From you graphs it tells me that all I need for gaming is a 4C/8T. Im thinking you need a couple of games to show where a difference in cores can be more of a deciding factor in your conclusion on which CPU to buy. Fully understand is this is not possible.
If you check out this:
the 4C/4T i3-9 gets crushed on frametimes by Flight Simulator
Same story here at 128-player Battlefield 2042 (with the i3-8)
The 4C/8T i3-10 does fine in the same test.
Also:

Microsoft Flight Simulator - Op reis met Ryzen 5000 en GeForce 3000
Met een uitgebreide selectie processors en videokaarten gingen we aan de slag in Microsoft Flight Simulator (2020). In dit artikel vind je alle benchmarks.
the now 4C/8T i3-10, with an RTX 3090, is identical to a 6C/12T i5-10.
So in fact for gaming any 10th-gen or newer i3 or better is 'fine', because 8T (or more).