Actually I think that for me, the main argument for these sub $100 handhelds is portability.
I always have the Powkiddy V90 in my pocket when I'm out, the form factor is just perfect - GBA SP style. Though unfortunately it feels really cheap unlike the RG350P. Low specs, mushy DPAD, overall poor build quality, terrible screen refresh etc.
What I really want is a V90 with the build quality / specs / software of the RG350P. I think that would be perfect
I really didn't need this RP2, but just couldn't resist the Gameboy aesthetics
For any serious portable gaming, my favorite thing is the GPD XD+ with CleanRom. I wish they'll make a successor soon
I was a fan of the GPD Win series - got the Win 1 and still have the Win 2, but now I think that they are an overkill for what I need, so I didn't get the Win Max.
You sure can do way more with the Win series but I don't find the need for it anymore, and Windows 10 is terrible UI for a handheld.
Also, I have a powerful desktop PC for serious gaming - and I find playing such games on a 120" 4K projector works better