Seems obvious to me that having PS4, PS4+, PS5 versions of multiplatform games on a disc is better than having two discs, one with PS4 and PS4+, and one for PS5. One obvious benefit is that you can enjoy an improvement on a lot of your gaming library when you buy a new system without having to hope for, and then buy, a remastered version. The benefits are so obvious, and it's something that Sony is finally implementing on Playstation thanks to the Neo, that it seems irrational to me that anyone wouldn't want that same benefit in the future. What's more, to defend a company not implementing that in face of their direct competitor doing it, would be complete madness.
Oh my, nobody's talking about exclusives.