@Red-Supernova
No particular reason, she just never felt good at home, other changelings annoyed and she didn’t care much about invasions - she discovered living with ponies is nice and they annoy her less ;) Now that changelings are reformed she has to confront those feelings once again, especially since one bug has decided to tell everypony she’s a changeling as well…
@Red-Supernova
In some cases, artists and other users simply don’t like the designs or characterizations of certain characters or species. I’m fairly certain a sizable fraction of the fanbase didn’t like how the debut appearance of the yak species in S06 was handled. I know a fuckton of the fanbase hate Towhere. One of the more unfortunate aspects of that finale was the Joestar Changelings had like two minutes of screentime and in addition none of them had dialogue, and we had to wait until CelAdvice before we any substantial information of them… Of which CelAdvice provided one, but whatever. XD
Ultimately, artists have opinions, they have choice to draw, et cetera what they like and ignore what they don’t. The quality of comics or fics where Discord don’t appear might not be directly affected by his absence depending on the context, lol.