I think I've spent most of my time thinking about them either during the series, or in a time frame shortly post Hogwarts (like maybe in their early 20s, but usually in an alternate reality fanfic or something like that). As the epilogue was so brief, it only struck me as an afterthought, and I didn't pay the details mentioned in it much mind. Cursed Child did give me more of a sense that the events in the epilogue actually were meant to be part of the story, but, it really didn't feel the same, and I understand it wasn't actually penned by JKR, so that may be why. I will admit I was a little surprised about how Harry was presented as a parent in Cursed Child. I'd like to think that Muggleborns could put together some useful, searchable databases of spells and magical artifacts and the like.