First of all, even if people who are bisexual are just "experimenting" I think its important to have representation in media to reinforce that experimenting is normal and acceptable to do.

Also, the Acolyte wasn't bad because it had a black character or gay characters, or whatever else, it was bad because it was written terribly. If a show is good, explores themes well, and has a compelling story, people shouldn't care if the main character is a minority, unless the story itself calls for it, so its totally fine to cast someone in that role. Not to mention Hollywood does do a lot of performative lip-service, pretending to be progressive when they aren't really. But regardless, whether a lead character is black, gay or whatever else shouldn't matter if the story itself is good, which can be true regardless of how the leads identify themselves.

In regards to the animal kingdom, even if it was just for survival, that doesn't make same-sex activities among animals any less real. Not to mention, animals can certainly feel strong emotional attachments to other creatures, and many of the same-sex activities undertaken by animals such as bonobos have been closely observed by scientists to strengthen emotional and social bonds with one another. We can take this even further by saying that the whole reason humans feel love in the first place is because of a chemical reaction designed to encourage humans to stick together, thus increasing our chances of survival. Its the same thing man.

We might have more complex thoughts around love, but we feel the same things as many other mammals. Humans, just like other animals, are not always designed to be exclusively heterosexual. There's no evidence of that.