What you're describing seems to be healthy vs unhealthy relationships (marriages). If two people are forced to be around each other and don't like each other you're going to speed up the decline. It wasn't WFH that did it, it was the fate of their relationship the entire time.
Things like this make me thing the idea of basing society on monogamous marriage is unrealistic and doomed to failure. It only worked in the past when work prevented couples from spending much time together, and social pressures prevented them from separating.
I.e., when the two of you are finally home alone and awake, because school is in session.
I suspect for some marriages, WFH has been a real blessing.