I more or less agree with basically everything you wrote. There's a pool scene with Julie in the daytime, a scene between Julie & Linda at night, and that's it. You could count the "Valencia" special scene with Linda because it obviously takes place in the equivalent of the pool, but in my opinion that's a stretch since the pool isn't of any interest during the actual scene.
More scenes for any of the 3 would be nice, no matter if before or after reaching a certain point in the relationship. There are only scenes with Linda in the bathroom and the dining room technically has none (there are Emily's RPG-inspired scenes and Julie's date night, but none of them actually take place in the dining room). There is no option in your bedroom to fantasise about Julie or Emily and Emily doesn't have a visit scene in your bedroom. A real scene with just Julie & Emily would also be nice.
There's still so much potential for more scenes, and there are even hints for new content in the dialogue. And a lot of sketches in the gallery look really nice and interesting. I just wish that all of this doesn't stay as "an idea for possible future content that was never expanded upon".