I feel like it's a fairly universal issue with the way they're generally... Not very human? You could kinda say the same for a lot of characters in the show but the women in particular suffer from being made into children. They're quite extreme caricatures and very tropey.

I could be being harsh on it really, but compared to shows that respect their characters and write them to be human being instead of "female anime character" it's real noticeable in Steins. Again, it's really ok to enjoy that at times, I don't really dislike it as a thing completely, but I like to mention awareness of it if I bring up a show or someone else will point it out.