I agree, but I think it makes sense to offset that by making progress with Kira and Alice MUCH faster to give the player some significant rewards in the early to mid game. You don't want the whole game to be a slow grind with minimal reward til the very end. You want meaningful rewards all the way through.Playing this game for 2 years and seeing its development, in my opinion both Lisa and Ann are two characters that have to keep the player wanting to see more, therefore they are slow character developments because there is a fear that by giving the player what he wants (have sex with Lisa and Ann) the player leaves the game and they cannot continue earning money with it.
Olivia is another character that I think would be a great choice to progress rather quickly to allow some satisfying progress in scenes that include Lisa even if Olivia is the one MC is making the lion's share of the progress with between the 2 for extended periods of time.
I have no idea what the plan is for Ann. I found her storyline pretty ridiculous in the original so I would love to see Aleksy change her story completely to something more interesting and hopefully more plausible. I don't expect an adult game to be realistic, but it's nice if there's at least some effort put in to make the story make sense.