The nuclear family was already a postwar, industrial era, departure from traditional family values. Traditional societies almost universally prioritize multigenerational households.

"Multigenerational households" doesn't really describe what we're moving towards, though. We're going from larger to progressively smaller household units. Nuclear families were an unfortunate step of this atomization, and now even they are being broken down further.

We’re not moving towards it at all. Just saying it’s a short-sighted anachronism to claim that nuclear families somehow represent traditional values.

Not really. Many men are just downright unpleasant to know, yet alone have relationships with. The ugly head was when women were forced into relationships with these men.