Like most blended families, we were already in a ‘social bubble’ of sorts. One composed mostly of people who don’t spend time together, and where we have absolutely no control over what the other adults do. In fact, some of the adults are only indirectly linked through the children.
I’m pretty sure the my ex (who has few friends and no family nearby, plus he loves rigidly sticking to anything that’s no fun) has been seeing absolutely no one but DS, and limiting time outside the house to the bare minimum.
We’re also pretty sure that DH’s ex has not been doing these things. She’s definitely been having her family visit, and also having her boyfriend over/staying at his (who lives with his family and works in a care home). But she habitually lies (even in the face of overwhelming evidence) and there’s no way to prevent her from doing anything.
I’d imagine that many people’s attempts to have any kind of hermetically sealed ‘social bubble’ of a particular size will be similarly impossible to regulate. How do you control what your brother does so that you can see your parents, for example?
The alternative to hermetically sealed bubbles of X number of people is probably worse. If every individual can just pick X number of individuals (with no overlap to the X-1 number of other individuals their spouse picks) then it seems a largely pointless idea. Why even bother with limiting social contact at all?