I don't think having 5 LIs is all that much. This game would be so boring if it only focused on Bobblehead and Slutnessa. The problem is the distribution of content between them had heavily favored those too. Any other girl in the game is plot advancement, I suppose, and offers content for non-NTR players. Amber with Mario. Angela with Grandpa. Ivy as an alternative to whatever Ann would be doing with guys while on campus. There will probably be more side chicks (hopefully hot ones) that Chris will offer for the sharing deal. Those won't make much a difference because they're one or two-offs.
As far as branches... yeah... We have Vanessa, Vanessa (with blackmail, which is thankfully closed off now), Vanessa/Joe Rival, Ann non-corruption, Ann corruption, and Ann Hate. Three routes dedicated specifically for bobblehead is a bit much. I've told him as much, but I would have not even done a full Ann hate route. It would just be where she shows up as a friend, but no extra scenes with her slutting around with other guys. I see the value in Joe rival where he could NTR MC, but it's not very well utilized so far.
However, if looking at long-term, it's nice to have multiple routes where people can replay and enjoy the game in different ways.
I don't think most sensible people would complain about 3-4 times per year.