This may sound dumb, but just figure out what systems you want and get a device that can run them well and don’t worry any more.There’s always gonna be something newer but current devices really have no issues with a ton of systems and there will never be a reason to upgrade for performance reasons. I got a Miyoo Mini Plus and it’s perfect for anything PS1 or below. It’s really an endgame device if you don’t care about other systems beyond that