So you just want to watch a bunch of random porn scenes then? pornhub is the place for that. This a visual novel with a main character.
Valid observation, on a couple of fronts.
I led by saying that my main character could be pursuing one character at a time. In that case, if the MC was not interested in the other girls, they could get it on with someone else and I wouldn't object to having to see that, assuming the scenes were hot. (The same would apply if we were given the choice of MC.)
PornHub is not for me because I never know with real porn whether someone was exploited or coerced to create the content. There's no human trafficking guilt in CG content and I can be more morally at peace watching / playing a VN. And since I like seeing sexy people doing sexy things, it works for me either way (MC or NPCs in the scenes).
Further, there's not a lot of text-enhanced content (like internal dialogue) on PornHub, or media where I get to choose the pace of advancement (clicks), or creations where all the characters have statistically unlikely figures that match my personal beauty aesthetic.