My 2 cents: SBMM means you keep playing the same game against the same people (ie people who play the same way and the skill as you even if they are different players) so the games lack diversity especially when the constant challenge keeps players playing the meta instead of diversifying their load outs. You also never feel your self get better because the games are always the same difficulty. As you get better so does everyone in your lobbies. There is more to it of course. Ranked is a great place for SBMM but in pubs I'd rather play against a diversified lobby. Generally there will be some people better than you and some worse. And for me that is what made older CoDs more fun because SBMM was minimal.
GTA 6 will be shipping with a new version of PSSR for the PS5 Pro as well as a 120hz mode, there does not seem to be VRR support.
This is per datamines by @TexFunz2