If the issue is that an AoE attack has been found beneficial in a single target rotation, why not give Focus spec a viable single target attack? Replacing 8k elemental damage with 800 energy damage is not an appropriate response. In addition you have greatly reduced our group/mob/multi-target attack. Focus/Rage spec already struggle to be a relevant build in comparison to Vig, look at parse distributions to prove I'm wrong (http://parsely.io/parser/leaderboard/guardian/all/2500000/all/live/0/) and see how many Focus spec are in that listing.
Thank you for crippling an already under performing build.
Sincerely,
Adote, The Ebon Hawk