Well as a Fratt shipper this is the kind of shit that makes me squee out loud, but I do have to say that I think this gets at something very important: neither the Defenders nor Foggy&Karen quite understand Matt's actual philosophy around vigilantism. During the long rooftop chain scene, Frank and Matt both articulated their positions in vigilantism and killing (respectively, you can't take the chance that people will change because when they don't more people will get hurt vs you can't condemn and kill people because that means you kill people who have changed/will change for the better).

Frank got how Catholic Matt is, how he bizarrely enough believes in hope and optimism, and also how Matt does enjoy violence ("that's just one of the perks?") but it's not like it's his primary motivator, you know? And Matt got to the core of Frank too, how he does genuinely believe that he's doing good and that violence/death is the only answer, and how he is motivated by his grief but he is still actively choosing to kill people in the absence of anything else, and how he views himself as a real force for good instead of a schoolyard bully.

I don't think, canonically, we've gotten a scene between either the Defenders or Foggy&Karen with Matt where they seriously sat down and talked and listened to each other. Nelson v Murdock was all hurt feelings and horrible insecurities and feeling like you don't know your best friend vs all your worst abandonment issues coming true, and the Defenders just don't have that emotional intimacy yet.

And Frank sort of has a gift for understanding Matt, and canonically Matt has this gift for seeing the good still in Frank. It's one of the reasons why I ship them so hard, and I love that the MCU did this.