Hey just saying if you have to have a character explicitly state that they or another character have changed, then you’re doing it wrong. If you have to get a character to tell us about this change we’re supposed to have seen, instead of the audience being able to figure it out for themselves, then you haven’t written character development. You just haven’t. That’s not an opinion, that’s literally how (screen)writing works.
Kara and Mon-El talking about how much he’s changed isn’t showing how he’s changed, it’s just trying to fill the hole where his character development should be.
Character development done right doesn’t need to be talked about by the characters.