Modern Family. Why?

The Office did a great job of circling back in the end and reminding us that the whole reason that they were being filmed, by showing the PBS commercial and having the cast in front of an audience et al, was for a workplace documentary.

In watching Modern Family for the first time in a few years, I can't help (while loving it, mind you) but wonder why the hell are these people being filmed? Is it really to show the "modern" type of family? They never address it, even in the pilot episode.

Anyway, here's a photo of one of the actors from the show I've randomly selected.