"Subjective experience exists" doesn't imply there's a single, uniform fabric of experience, nor does it imply anything about how subjective experience relates to an accurate perception of the world. Even if I hallucinate something that doesn't exist, there's still a subjective experience that I have of that perception.

I have no idea if anyone else subjectively experiences anything; everyone else might just be philosophical zombies. I still want to know why I have any subjective awareness of the world, though, and I don't see any way that that question can be answered via any sort of objective measurement or scientific process. You can study my eyes and my brain to explain why I can accurately perceive the color blue, but nobody can truly explain what it's like to see the color blue.