It's not strictly intentional; it's a consequence of the strict DRM on modern consoles. Decryption keys are needed for content to be loadable and in some cases you need the actual OS the console is running, too.
I can only assume they intentionally leave this last hurdle up so the general public are locked out until the development is done and the console is commercially obsolete.
That's where the group that validates rom dumps gets their name from: No-Intro. Because old rom dumps used to modify the rom to add an intro advertising whoever cracked or dumped the rom. https://en.wikipedia.org/wiki/Crack_intro