The only thing I can think of is the “North-facing” LED positioning; this has the chunkier part of the switch towards you, which can interfere with some shorter caps including GMK’s. Not all switches will interfere with said caps; stuff with a “long pole” or shorter travel won’t, and neither will any of the Kailh BOX switches with the circular stem shroud, for example. If you use medium to tall caps it’s not a concern at all, but it is a potential limitation to be aware of.
As for Drop (whom we sometimes affectionately call Dorp), they are indeed a fine place to get keycaps, and they do have that new loyalty program thing going on - but if I can get the same set or dodad from a smaller vendor, I tend to opt for that.
As a side note - it’s been exactly one year today since I threw a little DORP sticker giveaway.