Celestia isn´t the Goddess we all have desired or looked for. The one who makes everything relevant......is Twilight, in front of our faces since the first second.
Both in the show and in the timeline , Twilight and the Mane 6 have developed themselves and have been the focus of this show. Their actions are more relevant than the rest and they by accident or intentionally, serve as a plot device to make everything else important. They are the key for everything. So the CMC came after, the species(griffons, seaponies, changelings,dragons...) came after because of their open mind to travel and have new experiences, Luna redeemed herself because of them, Candy and Shining Armor hone because of being related to Twilight all of a sudden.... basically everything they touch or the screen decides to be touched starts to get relevant.

Celestia however, while seemingly being above Twilight and Equestria.....she is not. In fact, she was not a character from the start, but an ARCHETYPE. Yep, a model for Twilight to follow just like Faust wanted. Celestia was considered as the ultimate position at first because she seemingly gave those vibes in the first seasons. Her character and context was not developed, she has been more incomplete than Luna and maybe Cadence.
That´s why I feel confused about her in trolling completely. She wanted to feel in touch with the mane 6.....and so with the audience because her royalty was really overhyped. She admitted that she has learned a lot of things from Twilight (in Celestial Advice) and in seaosn 7, that´s definitely the twist where Celestia becomes an actual character. Writers didn´t know how to make her down to earth so her trolling abilities would put her as a more relatable character.
This episode has deconstructed that being a leader doesn´t mean you are different form the rest. In fact, I think while trolling the mane 6 at the end, she was partially saying the truth. She enjoys from the inside some usual things that happen in the routine outside her princess role. Probably because of boredom or feeling tired about seeing her image being so praised and elevated into top levels (like Twilight does)
Celestia has always been an incomplete character in the end. The Mane 6 and what followed them do. Celestia was considered as them while she didn´t offer anything interesting in front of us. She does when she gets closer and meets the mane 6 more, now integrated in the cast like she has been fakingly considered one of them.

You cannot say that Celestia has been out of character...because she has not had one despite her apparent deity image. We only knew that she liked to troll and have conflicts with her sister, but that´s it. All of this comes...because of the mane cast. They are the ones who have given Celestia a chance to shine and so, make her complete.

I however, must show my amazement about the huge fan content involving Celly without literally nothing on her. Now,it feels that her material is paying off. Celestia having episodes and an actual character.....is ironically fanservice.