"EF communities interact with each other after Mass"

JE, I have thought about this a little, and it has been my experience in AU and EF parishes that what you state is correct, i.e., there is typically a coffee hour/brunch/potluck after the Mass, but I suggest that for many typical OF parishes, that would be difficult, particularly if there are several Masses offered consecutively on Sunday a.m.  The small communities like EF/AU parishes, again typically, only have one Mass on a Sunday, so, for instance, they are not concerned with the parking lot still being full with folks from the prior Mass.  Put another way, it is good fellowship and support, but it would perhaps be difficult to achieve in certain parishes.

That being said, I do wish that folks would have that fellowship outside the nave, at least, after Mass, and perhaps be aware that some folks will want to offer thanksgiving after Mass.