Ok, Sombra being a good guy was in an alternate universe in the comic books. It's not canon
I do think reforming the villains is overdone. It mad sense with Discord and Sunset. Diamond's was rushed but i give it a pass. But Starlight and Trixie? Did they really have to be reformed? Why couldn't the Cutie Mark Dictator stay that way? And i absolutely hate Trixie, so she didn't deserve any second chances.
Gilda was reformed? Since when?
While i love Starlight Glimmer, i preferred her when she was a dictator trying to take everyone's individuality and messing up the space-time continuum. NOT a sad little pony who blamed a cutie mark for taking her childhood friend away.