And thus, Emerald Charm was a handy solution to any global enchantments (for you younglings, those enchantments which don't enchant anything in particular, such as Form of the Dragon or Worship), a way to bring flyers down to earth, and a second use of a utility creature, all wrapped into one neat little charm
The field spell is designed to recover the traps which I expect would get used a lot, and give me some breathing room if one of my Lethal Lords is killed and I'd normally be wide open for attack
Even if those two things are foolproof safeguardssomething I doubtpeople would have a hard time believing that if their collections all go to zero
Then again, Alchemy is a more fluid format of near-constant change than Standard, so it may not have been deemed "wasteful" enough by WoTC
GX did a lot of things as far as reshaping the franchise's competitive metagame