They’re complete losers in canon. They only have two modes: simps for Spike and victims who need someone else to save them. I think Games Ponies Play is the only episode where they didn’t need saving… but they still needed the Mane Six to convince the inspector for them that their empire should hold the Equestria Games.
No wonder Sombra enslaved them. The Crystal War timeline was the only time crystal ponies actually did something.
Doesn’t help that they simp for Spike… and for him alone, entirely forgetting Cadance, who exhausted herself keeping Sombra’s influence away from them in the premiere. There even was an IDW comic that showed the crystal ponies fawning over every princess… except her.
Just remembered. They weren’t even there during the Avengers Assemble scene
in the finale. Everyone and their dog showed up, but not them. Crystal ponies literally do not exist unless they need someone else to help or save them.
I think you’re right that the lack of important crystal pony played a hand in this. The other three races were usually explored through their respective Mane characters if I recall right.
edit: Thought some more about it. All other species had a character from the start. Griffons had Gilda, dragons had Garble, changelings had Chrysalis, kirins had Autumn Blaze… even the freaking breezies had Seabreeze. And obviously most of them had more characters from there on, especially with Twilight’s school.
Meanwhile, crystal ponies had… Radiant Hope. Who exists only in the IDW comics.