Millenials and Gen Xers (the cohort of which are now raising young children) were raised in a cultural wasteland of sarcasm and irony poisoning, that arose as a response to the perceived "campiness" or naivety of sincere art. And we were force fed it for decades until our "guffaws" and recognition of it were habitual, instinctive, and always expected. Nothing could possibly ever be funny without being hyper self-aware and critical of everything.
The reason these new shows are connecting with us now is precisely because of their outright rejection of this. Sometimes things can just be nice, and fun, and good, and there's no smirk to the camera, or higher level joke being made. It just is.
Postmodern meta-irony is out. Radical sincerity is in.