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Strip off the parasocial aspect from a vtuber, and all you're left with is an average woman who is average at everything she does (playing games, singing, comedy, being entertaining). You watch a vtuber BECAUSE she is a woman, because in terms of actual entertainment and production values, you could be better off watching a film, listening to actual music or doing pretty much anything else and you'll be getting a more enriching experience out of it.
Be honest to yourself. There is no other reason to watch a vtuber other than the fact that she is a woman trying to entertain and please you.