With Xboxes you have dev mode so you are definitely buying the Xbox. The Switch technically doesn't have a web browser so I wouldn't define it as a general-purpose computing device. The PS5 should definitely get a dev mode like the Xbox, otherwise while it can do general computing tasks like email, messaging, document editing by plugging in a mouse and a keyboard and you can't run your own code on it then you don't own it and are simply leasing it.