The PS5 is already a very powerful piece of hardware that most devs aren’t making full use of. I honestly can’t see any justification in a hardware upgrade other than some Sony execs thinking it’ll be the end of the world if they don’t put out something new to make some profit line continue to go up.
Not that I know of. I do a lot of native development mostly on Mint and Endeavor. I use pretty much the same tools on both and get a nearly identical experience. I’d say just go with what feels good to you.