Agreed, and 4 years into PS5, the onus on making the PS4 a "quality" experience is lower, vs. just giving PS4 owners "something" to play e.g. in developing markets where people mightn't have upgraded yet.

An analogy I might draw is the FIFA games, where FIFA 14 came out on the PS4 and PS3, but also the PS2 and Wii, which were just roster updates of previous years (no new gameplay features whatsoever), and clearly that was acceptable to enough people to give EA the trouble of developing, printing and distributing.