I have issues with the earth pony magic personally tbh.
It feels to me kind of forced as it still comes down to casting spells in unicorn-like fashion and I am certain unicorns are capable (or should be capable) of doing the same feats. Kind of gives me vibes of, what I like to call "force Discord call" from Star Wars sequels. Unnecesarry, forced ability that feels more like a plot convinience than actual power that fits in the worldbuilding.
There's argument that every race must have magic and pegasuses do as well, but the truth is - pegasuses have wings that allow them to fly, they don't utilize magic for it, in fact, I never understood why would they lose that ability in a movie. All I can think of is "they forgot how to use them", but it was obvious that with proper help they could manouver well with using them so that argument falls apart rather quickly. I suppose they may have became heavier, held down to the surface, but even that's a far fetched theory.
Anyway,
I always believed earth ponies had one thing that pegasuses or unicorns could never possess - creativity to overcome their physical boundaries. What they couldn't solve with magic or wings they could with their brains. Earth pony magic effectively disables that. They no longer attune to nature, for example like farming ponies would - they simply tap their hooves and stuff happens. In a way, I believe it cheapens earth ponies instead of giving them feeling of significance (which they had already without magic).
Since earth pony magic, so far took much space in generation 5 I sadly have to say I am not a big fan of this magic system. It's not bad, don't get me wrong, but I think the one from gen 4 was more meaningful.