The kicker is that owning the disk entitles you to a piece of plastic, and not much more at the moment.
When servers go down, or day one patches are no longer available, the disk becomes no better than a coaster for many modern games.
i mean...you could always buy the add-on disc drive? Assuming that it is still compatible with the Pro, not sure why it wouldn't be. They get to fleece physical media heads for an extra $80, that's a win for Sony.
the hardware design team is so far up their own asses with the PS5 design. Here's two articles where you can read how high they are on their own supply: One, Two