Maya is/was not a lesbian in the true sense, considering her past. She has always been bisexual, but her experiences with boys in her past have made her feel more like she belongs to the female gender.
DPC doesn't force you to do anything, and your argument can be turned around in terms of Maya's interference in the saga story if I want to. That would not be a problem for me.
Example. Sage picked Quinn as vice president, gave her too many freedoms, opening the door to drug trafficking and prostitution. She is a bad president. Simple.
Paragraph two is also easy to answer. If Sage, as Tommy once remarked, had better control of her girls, the MC would not have ended up naked on campus in the first place and would not have needed Maya's help.
Paragraph three can be answered by paragraph two. How is Maya supposed to call campus security? As you mentioned yourself, Quinn, Sarah, and Mel were present. They would have stopped Maya 100%. I mean, they incapacitated one person with a teaser. Which I think raises more questions. They certainly didn't tease Derek. But why the MC? Maybe they knew he knew how to defend himself.
On point four, I'm going to be subjective because I'm biased. In EP8, we see a Maya who is not a lesbian. She is one of the hottest things walking around campus and gets a 10 out of 5 on the Sage scale from me. Ergo, she raised the bar by 5.
Just to be clear, I actually like all the girls. Well, Quinn not so much. But I don't hate Quinn either.
Wow, this example got longer than I thought it would.
Long story short. DPC doesn't force you to play BaDIK. You do it by choice. He develops the game and the story to his liking. If you can't live with a sexy Maya and a sexy Josy taking up a large part of the story and a lot of time interacting with the MC (tremolo = musical term), then don't play Being a DIK.