Background Pony #761E
Fandom respectability politics, one would imagine.
However, executive meddling (plus the audience) kept demanding that Twilight & friends remain the protagonists, resulting in the mess we know as the final two seasons.
FiM would have been improved as a soap opera, where it’s accepted genre convention for characters to retire from the protagonist slot once their arcs have concluded.
Help fund the $15 daily operational cost of Derpibooru - support us financially!