My point was that, as a family history enthusiast, from my experience, personal and on this site, sologamy would not present particular difficulties in research.
It is not yet a norm but may point to people’s state of mind or needs which may help understand society at a particular time, as you say.
However, it would not be as difficult to unpick as, for example, relationships where surnames are used for a time but then the persons move on and they and children use new names.
We come across family groups where the children are ‘yours, mine and ours’ and records have to be acquired to sort out ancestry.
I would say they are the kind of changing norms which we have come to appreciate in our shared histories.