The amount of weird stuff happening onscreen cannot possibly be fixed in a patch or two. The entire game code is a ticking time bomb. If the game cannot retrieve an asset or a script fast enough from the mass storage, the entire system go bonkers. The PC saving grace is having a fast SSD but I'm sure that I'll be seeing the same if I were running the game on a PC with a traditional hard disk.
Nah. The game works fine on an HDD even if it's overloaded. No crashes, at worst assets pop-up. The game is full of glitches, but only few crashes and game-breaking bugs are of that variety that you know to reload immediately.
I really don't get people still using HDDs for gaming in CURRENT_YEAR.
Depends on the game, but in general you can get away with it having lots of RAM. In Cyberpunk, loading assets still takes many CPU cores and an SSD won't help against that.