No more CLEU SPELL_CAST_SUCCESS?

[Cybeloras]

It seems that CLEU SPELL_CAST_SUCCESS no longer occurs for spells with cast times - it only fires for instant cast spells now. I couldn't find anything about this change anywhere - has Blizzard said anything about it or why they did it? Either its a bug, or they did it for some reason of game/addon balance, but I don't really see how it could have been such a big issue to warrant its removal.

Any thoughts on this?