It is, like Twilight was already doing good. Discord does not need to enact his half-baked plan. If anything, it should be a final test in a form of an external threat. But you know, that happened.
They still showed repentance for their errors when given the chance to see them
Cozy doubled down on her errors
they took being bested by the Mane 6 and offered a chance to start over extremely differently.
And yet he still did it of his own volition; he decided he wanted Fluttershy's friendship more than any kind of chaos he could muster and deliberately chose to reform himself to do it
And Discord still at least complied with what Fluttershy wanted; it was malicious compliance, sure, but it was still compliance and that still lead to genuine reform. I'd imagine Cozy would be more keen on pretending to be reformed to continue manipulating things towards some plan, given she only really sees friendship as power and not as a social bond. Someone who only sees friendship as power is not going to be very receptive to changed perspectives; Discord only saw friendship as a hindrance, so he was more open to change when shown that it can be other things.
As for Starlight…that's exactly why Twilight had her as a student in the first place, you would think, is to keep an eye on her and guide her along the process of becoming a better pony and ensure she didn't relapse. Plus her whole deal was that she lost her friend and felt too afraid to make more; with the Mane 6 all willingly becoming her friends despite what happened
Twilight and Cozy's entire ideologies are completely at odds and neither is willing to back down; Twilight views friendship as a bond first and a power second, while Cozy purely thinks about it in terms of power with no element of bonding. There's a reason her Cutie Mark is a chess piece, after all; she views others as pieces in her game, things to be manipulated for her benefit.
The thing with Discord is that his entire thing is chaos, which is inherently un_predictable. Sure, with his power he COULD_ bend reality and make himself king of all…but that'd make sense, and what fun is there in that for him? He gets way more enjoyment out of screwing with others than he does breaking reality to manipulate them into some grand plan
As for Starlight, Twilight appealed to her better nature primarily as a last resort because she couldn't win in a test of might and wit; if you can't beat them, try to talk them down so they stop of their own volition.
the trick to rehabilitation is the one being rehabilitated kinda needs to be, well, open to it for the idea to ever matter. Discord opened to it just to humor the Mane 6 but was ultimately reformed for real because of his friendship with Fluttershy. Starlight was convinced by Twilight to rehabilitate herself to escape the vicious cycle that had consumed her for years.
Cozy Glow never shows openness to rehabilitation; in fact, she literally tries to betray Tirek and Chrysalis after their little escapade in Frenemies
And Cozy's entire thing is manipulating others into doing whatever she wants them to do and then discarding them once their usefulness expires, as well; how could you ever be truly sure if she was legitimately reformed or if she was just doing it for the sake of some kind of plan?
Cozy's ultimately just too much of a liability to national security to keep around unfrozen. No telling if she can't easily devise a way out of any facility they try to put her in, and her crimes would be plenty enough for capital punishment if that were a thing.
Heck, maybe being turned to stone IS Equestrian capital punishment, for all we know.
Pointing out all of the bad things that she did doesn't change the fact that Discord and Starlight did equally bad things multiple times. As for Frenemies, the fact that she showed actual interest in it shows more potential in her then Discord ever had prior to his release.
Discord didn't want reformation either. Fluttershy had to work with him specifically for a while and not give up on him to get to a point where he considered reforming and even then, there were many relapses.
Starlight and Discord were again, not given up on. There was actually an attempt made to reform them, unlike with Cozy. And frankly, Cozy's no more dangerous then the reality warping being who can be just as manipulative and can shapeshift.
If others who were just as bad deserved rehabilitation then so does she. If Discord was turned back to stone and placed next to the trio then I wouldn't be complaining nearly as much.
do not take MBTI test. it's basically "are you normal or are you a Sociopath" in disguise. the questions try and trick you into thinking one way. personality types can't be quantified by just one trait. look at Fluttershy's entry for example compared to how she is now. her entry is outdated and wrong because now she's more assertive and can get emotional or angry.
They had the elements of harmony against discord, what deal?
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