Reflecting some more on your comments here, it's interesting that the absurdity of the whole situation is another thing that it shares with "Ted Lasso," as well as the "lovable misfits" cast. The situation is a little more absurd, and the misfits less attractive and less lovable, but the similarities still hold nonetheless imo.
Whereas the obvious theme of "Ted Lasso" is "believe," I would say that the theme of "After Life" is two-fold: "Life goes on...and love is what makes it worth living."
When I first started watching "After Life," my wife kept commenting on the rest of the cast and how much she loved them, e.g., "Don't you just love the postman?" For most of the first season I grunted and said they were fine, but I wasn't sure what there was to "love" about them. I will say that the show has since succeeded in showing me that there is something to love about at least most of them; still working on the hoarder and the fat kid. But I sense that that overall message--i.e., that there is something to love about everyone, even the misfits among us--is one that is central to the show.