Okay, now, Ginger, here's the thing about Celestia.
She is not a dynamic character. As it stands her defining character trait is being... well, perfect. She's wise, kind, humble, gentle, generous, warm... the list goes on. She has literally no character flaws beyond the occasional bout of trolling, and even that is normally spun quite positively because ponies always learn a lesson when she does. That's not an interesting character; there's no inherent conflict there. Nobody wants to watch a character being good at stuff for 22 minutes.
Now, if you gave her an episode that showed her with flaws, she would suddenly become much more interesting, and probably more popular. Which is an unfortunate catch-22 - she needs focus to get focus - but it's unfortuneately how the fandom works. Why do you think almost all fanon of Celestia is alternate character interpretations? He canon character isn't that exciting. IT
could be, but it isn't currently.
He's an interesting idea: An episode focusing on Celestia and Luna, mainly on Luna. Luna is starting to resent Celestia again, because Luna is barely scraping by as a leader while Celestia seems so perfect. She keeps trying to one-up Celestia, or even just be as good as her, and keeps failing. Until near the end we see Celestia away from all the crowds and she just... breaks down. She drops the act, or she just drops, or something like that. BAM! instant new level to Celestia's character, huge leap in their relationship, enormous lesson right there.