Again, that's not the same thing as saying the "vast majority of BC games run better on PS5"
I'll give you another example, since you can only list Sekiro. Hitman (all of them) runs at 1440p on PS5 and 60fps. On Series X it runs at native 4k (though has a 1440p mode too) and drops occasionally, like the Paris stage. In that situation, the PS5 version would be better if you value locked frame rate above all.
But, on the other hand, you have a plethora of games that are 30fps capped on both and only have a higher resolution mode in Series X, like Final Fantasy X/X-2 HD Remaster or Nier Automata. In these cases, Series X will be better.
I'll say it again, when PS4 Pro was superior, like in Sekiro, PS5 will be superior too. And the reverse.