You see, that is true for ALL optional content that is (or going to be) in the game. It will be enjoyed by only a select group of people. In GGGB I didn't enjoy the Thug or Bimbo routes and probably won't be able to enjoy them, so it means I'm only experiencing 1/3 of the content. I'm sure there are people who were the opposite, and chose to go for Bad Girl Ash only, and trailed off from the Good Ash path pretty early on. The same is true for this game.
Just go back a couple of pages to see lots of arguing whether they prefer Ian or Lena. Most of the people enjoy both, but there are quite a few people who prefer only Ian and aren't interested in Lena's content (or just don't like the fact that she's playable), and those who are only here for Lena and skip most of the Ian's scenes. Someone is going to like Alison/Emma/Holly, others won't. Somebody is going to play as slutty model Lena, others will opt for a caring songwriter. Robert is pretty much universally disliked character, yet there are quite a few scenes with him, because why not. I'm certain not many would complain if we could trade some development time from Robert's route for at least one gay or bi route for Ian.
So, it all comes down to whether Eva herself would like to include this type of content or not. Or, state that Ian is strictly heterosexual and put the end to this subject. I'll be fine either way.