I think this is true. It has, at least, been important in my marriage. We try never to be deliberately nasty, which looks obvious, but after the cat has just thrown up because he overfed them and it’s 3 a.m. and you just bruised your foot because the recycling wasn’t put out again, which is supposed to be his job… it can be rough. Substitute “her” to flip it around.
This reminds me of a passage in a Kathleen Norris book about living in a monastic community. I can’t find the passage offhand, but the gist is thst living in committed community with others, if done with love, tends to work like a rock tumbler- you end up good and polished, but the friction isn’t necessarily comfortable.
I’ve only been married for three and a half years, but I think some of our rough edges have already been worn off. Lots of edges still to go, but it’s more than worth it.
In brief response to Chefguy, sorry for being touchy-feely again.