Well, it was positively established earlier in the show that Twilight, Starlight and co are extremely powerful prodigies, while most of other unicorn’s powers pretty much limited to weak telekinesis and whatever magic their special talent allows them to use.

jeeze, Amathyst has it rough, first she lost her job, and now she can’t catch a frikken ball with a bucket

to be fair they pick all the shittier ones

Failurecorns.

Outdone by Snails, who as a result has been upgraded to an idiot savant.

They really were sort of pathetic, weren’t they?

Yeah, pretty abysmal.
 
But we’ve seen the next generation has a better chance.