I don't think 'classic' comedy is without pathos - 'The Good Life', 'Butterflies' and 'Dinnerladies' being prime examples. Also, 'black comedy' was a huge genre in the 80s and 90s (Blackadder Goes Forth, Withnail and I, A Fish Called Wanda...). As for comedy-drama, I have a theory that writers sit down to write a drama and it ends up being funny, rather than it being the other way round. Therefore, it can't be marketed as a drama because it's not miserable enough. The play of Fleabag is a lot more serious than the series, but still has funny elements - I think they geared it more towards comedy to fit the BBC3 style. It was different to other Fringe one-person shows, such as the likes of Caroline Aherne and Steve Coogan, for example, which were pure comedy when they performed live as characters. Just a theory, anyway.