The Switch is a compromise between power and accessibility. Nintendo considers it worth it due to them not putting that much emphasis on power since the Wii. Sony and Microsoft, on the other hand, are deep in the power race, so they won't really think a hybrid is worth it. Maybe a PS4 portable once the PS5 is done and the tech is there, but that's a massive stretch. Outside of that, other companies are more focused on full mobile than on the "shrinking" console market.