Here is the thing about Black Lightning. It has it's point of view. It's point of view is progressive race baiting nonsense, but it's the same shit you see an any black-centric thing these days.
It's eye-rolling terrible. But, you never get the impression they are trying to shove horse shit down your throat. They are just "telling their story....MAAAAAAAAAAN!"
Supergirl is trying to shove shit down your throat. They are all about being progressive and giving voice and changing minds and projecting "new norms". The show itself is completely secondary to the message.