A few days ago, I mentioned a tendency of fandoms to forget that fanon is something they arbitrarily made up, not ironclad fact. I think this tendency is a big part of why some people are butthurt by the whole Twilicorn thing. They have convinced themselves that alicorns are living gods, or that Equestrian princesses have well-defined powers and duties that will isolate Twilight from her friends, or that becoming a princess/alicorn was the end-goal of Twilight’s development–all ideas common in fanon, but with no basis in the show–and concluded that her acquisition of wings is an irrevocable and extreme change to the character and to the show.
To this I say: meh. As near as I can tell, the only changes are that Twilight can now fly (which she could have done at any time since at least “Sonic Rainboom”) and she’ll maybe be occasionally called in to assist the Princesses in an advisory capacity (at least that’s how I’m interpreting “We’re all your students now.”) It’s really far less extreme of a change than the one “Winter Wrap-Up” triggers; the difference between pre-“Winter Wrap-Up” Twilight and “Call of the Cutie” Twilight is bigger than the difference between “Crystal Empire” Twilight and post-“Magical Mystery Cure” Twilight.