1) If this was a different game, I would 100% agree with this. But there's one reason why I only somewhat agree on this game, the role of the step cousin. If you learn sexual skills through her, it'll be best to create content for all the girls after having the MC learn from her.
2) I think a girl's first time introduced to something should be a story scene and after that become a free action you can do with her in the right place/time. For instance, after kissing for the first time she'll allow it the same as small talk. But groping or other such actions she'll only allow when the two of you are alone somewhere secluded. edit: I will say though, I like that different girls get different story events that fit their personality. A few games have totally different girls go through the same exact things when you're trying to romance them.
3) 1000% agreed. Repeatable scenes don't need it as much, but so far there's a lot of one time story scenes. A gallery would be awesome.