2 4 6 Great is not that bad. It could have been much much worse. A worse approach for the episode would have had Rainbow Dash sneaking in Canterlot and destroying all notes for important tasks just to not taking responsibility of the cheerleaders. What we got was harmless.
Episodes like The Mean 6 should have been in season 3, not in 8.
A flurry of emotions is one of the best few episodes from season 7, but it should have been in season 6 since you have introduced her in that season.
The beginning and ending of the end should have been in season 4, not 9.
The parent map is an episode from season 8 that should have been in season 5 while Starlight was running away. That way we could have known her instead of giving her two episodes with a bad backstory and call it a day.
Student Counsel should have been from season 6, not 9, because by the time it came out, Starlight should have got better instead of being an ass.
And speaking of asses, A horse shoe-in should have been in season 6 and not 9 for the same exact reasons. By the time it came out, Trixie should have got better instead of being an ass.
I think this shows that MLP:FiM isn’t perfect. Maybe the reason why we like it is because it’s all what we have right now, but I think there’s a layer of improvement that the show never reached.
Still, I’m fine with the show the way it is because at least I can be positive on some great episodes.