You're a rebuttal! I'm just helping out. PSP Go's time has come and gone; it's quite outdated now.
Come and gone? Outdated? I'm a retro gamer...
I think the Vita (and PSTV, which is just a screenless Vita) runs PSP software via emulation, because it can change controls, colors and resolutions. It's pretty much perfect emulation though, just like PSOne on PSP.
Does the PS Vita only run PS Network downloads of PSP games through emulation or does it work if you add your own ROM's and does the PSP do the same for PS1 games? If you can add your own then do you have to also add your own emulators or are the official emulators built in somehow to work with both "official" and "unofficial" ROM's?
Anyway, what I would find appealing about the PSP Go set-up I described is that for the PSP games it wouldn't be emulating at all. It is so tiny including even the other models, it could already play ROM's without some homebrew flash cartridge, and since it is relatively new it seems kind of pointless to me to emulating it when it seems so simple to experience all the games on the original hardware. I mean, something you can fit in your pocket isn't really clutter that can be cleaned up by using emulation on other hardware instead. Anything else I may emulate on it would be like a secondary Virtual Console purpose but I would mostly be interested in playing the PSP games on an actual PSP. I also like how with that set-up I could play it on the TV or undock it like a Switch.
How does the PS1 games work if the PS1 controller has 4 shoulder buttons instead of 2? Are some games not compatible?