This is kinda a silly argument...its not like affliction has a lot of major glyphs and we have to make hard choices, especially with soul shards going baseline.
Now instead of
Soul shards + 2 optional glyphs
its at worse:
3 optional glyphs
and at best, UA + 2 optional glyphs
I'll certainly take it for PvE, even if i can cast while moving, its obviously going to be a small dps increase as its more time spent on channeling MF/Soul drain instead of recasting spells.