It would just be another Vita if it's a completely separate console from PS5.
I don't see why anyone would be against the idea of a portable SKU in the vein of SteamDeck (which is what I predicted). You don't like it? Skip it like I skipped the PS4 Pro. People are weird, "Oh but you don't understand! THE RESOURCES!" Bruh, Sony isn't a small company, they can afford an additional SKU with no impact whatsoever on PS5s output or their financial situation. Handhelds/hybrids are the future until mobile phones take over. If they don't adapt now, they will in a gen or two.