Massive Nerf to...Ghost?

Patch 6.9 delivered a crippling nerf to Ghost, the summoner spell. Ghost has always had a large portion of its value locked up in the enhancement, which used to be in the mastery trees, then got moved to the boot enchantments. Now the boot enchantments are gone so there's just no way to get that value back. Flash loses 20% MS for 1 second while Ghost lost 8% over 10 seconds...The spell was always seen as weaker than flash but now its just terrible.

I assume this is something that simply slipped under Riot's radar - I don't think they'd nerf Ghost intentionally...but it is now unusable without the enchant.