>but also the framing does go a little out of its way to show how their love is largely young infatuation.

I'm not sure that Shakespeare really had a concept of beyond young infatuation like we have today, probably the best examples (where the couple still feels like they have anything to do with each other more intimate than running a household) would be Claudius and Gertrude and Macbeth and his wife, neither of which couple had so much to recommend them over Romeo and Juliet.