So, more like an review, these are more my thoughts that the fandom has considered when it comes to these two protagonists.
After watching it, I´ve come to realize that we (both the writers and fandom) have been immature and really dramatic in the canon topics.
This episode made me realize that the Twilicorn shitshow was unnecessary. Mostly because princess hood is viewed as a different line to be a character, so it changes everything and the powerful position implies a different contact, lack of warmth after the celebration and loss of identity because of privileged positions that no one will ever have.
What has happened in this episode is the same as the Netherlands monarchy have celebrated their own birthday, they are people despite their position.
So it means that we all thought that Twilight being relatable and a cute pony would be lost from season 4 onwards. With Cadence that didn´t happen, neither was Luna, nor Twilight has done after MMC......and in the end, it isn´t for the the so claimed deity: Celestia.
Celestia has lived a lot and has been considered immortal and a demiGod.....when she, along with her sister, was a student from Starswirl. Who is the ultimate God here? Starswirl is also revived from its sacrifice and he hasn´t shown any sign of being a God either.
The headcanons about alicorns or deities have not been found, nor they are different from the rest of the ponies. Luna felt closer despite her position because she had an episode like Luna Eclipsed or Magic Sheep where she showed her personal emo but funny side. That leaves Celestia being the one responsible for everything that happened during those 1000 years, to the point we have asked ourselves if she was a good princess to hold everything. Well, she is not the only one nor the founder of everything. The Wonderbolts exist and so the Royal Guard, at least, they were able to protect by themselves by not going to unknown places.

But here is the catch:

Celestia is not the ultimate deity to follow, just because she has a good amount of years from his back, that doesn´t mean she has all the answers nor she is able to wipe out everyone from existence. She is a Royal figure and the peak of self defense.