i dont think you are wrong, but to me, it would be easier to manage. you could even have either a focused 90% content developed for 1 char per update, or something like 20% for a few per. being able to replay it(like dates with sex scenes) would allow them to stay relevant.Even if it were a sandbox, we're talking about like 20 DLCs deep worth of girls at this point - it's so, so many.
then again, im a defender of only adding as much as you can content for. so to me, instead of having 30+ i would make 5, and add 5 as i finish the ones before.