The PS4 has an HDD, and only partway through its life upgraded from SATA2 to SATA3 even.

Personally, I've got my boot drive, plus a 2TB SATA3 SSD for games that benefit from it's plus a 12TB HDD for the vast majority of games that don't need it (or to temporarily store games- it's faster to move them between drives than re-doenload them). So if I was planning on playing this games hearing this from the devs would let me know I need to free up some SSD space.