All this is correct, but keep in mind that you still leak domain names until ECH (encrypted client hello) is in wide-spread use. It is of course still a good idea to use encrypted DNS, just don’t assume your ISP can’t see which websites you are accessing.

Yeah, that’s mostly because performance is so poor without it.

and that your cpu might not be able to provide enough data.

That also depends on the settings and resolution you plan on playing with. The higher the visual settings and resolution, the more demand is on the GPU. So when you plan to play on very high visual settings at a high resolution, a higher end GPU might make sense even with an older CPU.

I am pretty sure that this is not true. While Intel Arc GPUs really should be paired with a mainboard with resizable BAR for performance reasons, they will still work without it, although with pretty bad performance.

oldschool computer processor

Perhaps a Raspberry Pi 500 (or the older Raspberry Pi 400), can do all the things an ordinary Raspberry Pi can, but comes as a complete device with built-in keyboard. Runs Linux and is rather easy to use.