In games industry nobody ships prototypes. If you manage to put one on Steam it's not going to sell much either. And yes, writing prototypes is normal, read on "Cerny method" if you are curious.
The existence of so many half-baked and abandoned early-access games on Steam would seem to belie this claim. It's not uncommon to see a few hundred reviews for games where the developers have ghosted without finishing.
How so? You think early access half-baked games sell? Or you think few hundred sales is a good number?
People making these games are not in the games industry because they are not professionals (they don't live off these games). Also, it's curious how people who have not even shipped a prototype game down-vote opinions from the insiders. Good reminder when reading comments on something outside of my expertise here.