This is a valid complaint that some choices are just "do you want less content?" (and not even sexual only, but also story content). Remove the choices to kill some characters and there'll be less dissatisfaction about lack of content imo.
I personally feel that giving the player the option to do so if they feel like it adds to the game. Some choices are obviously "bad", some are obviously "good", and some....yet to be revealed.
Take Emilia for instance. You can get her offered to you twice. Now, some players might genuinely not be interested in her so they choose to decline her on purpose.
But if you do that twice and then be surprised that you don't get her content (or that some updates that have a bit of Emilia content might feel shorter for you), well....not much we can do about it.
Another way to avoid bloated downloads is to make seasons like BaDik.
The problem with seasonal/episodic/however-you-want-to-call-them content for DS is, there is not a clear cut-off point. Sure, we could wrap up what we have today, call it "Season 1" and be done with it, but to me it feels weird.
It's not a self-contained narrative, it's an arbitrary end.
I'm not saying this might not be the case in the future. We might be in a position to do it (e.g. when Shani comes back from the Zone or whatever), and we do discuss such ideas, but there's nothing concrete for now.