Two examples of where imbue dancing is viable:
- say you are kiting LoS behind a pillar vs any pet class + melee. Thunderstorm melee of you and LoS the rogue. You can get a 4s sprint when using unleash elements vs the pet if its on you. The globals you spend on swapping flametongue for frostbrand, unleash on the pet for a 4s sprint and then back to flametongue while getting to a safe spot can be really good.
- vs any melee that trains you while you are waiting for your cd's to come off cd ... swapping to rockbiter and unleash it vs a rogue that's gonna dance on you negates 40% of his dmg on you for 5s (every 15s). That is a very strong ability for ele.
The problem on live atm is that it only buffs lightning bolt, and ele damage outside of ascendance being not really stellar, the trade off cost for not taking elemental blast (that besides the dmg component also buffs your next spells) was too high. Simply because lightning bolt dmg is a non factor in arena atm. It hits for nothing and takes 1.8s to cast, so you have to juke a couple of times.
Now with unleash fury also buffing your lava burst damage for 10s, the trade off cost for not taking elemental blast is much lower. You gain utility and it boosts a key spell with a very short cast, whereas on live you pretty much only gain utility. 10% buff to lava burst might seem low, but you have to realize it's up for 10 seconds out of every 15 seconds. During ascendance/EM that is practically 1 extra lava burst that you will gain. Or just think how often lava surge procs and overloads you have every 10 seconds, and count all the extra dmg lvb will do now.
TLDR the buff to unleash fury now compensates for not speccing into elemental blast, while gaining great utility. Rockbiter and frostband imbues are really good utilities for ele, but the amount of globals they take are not worth it on live.
On a fight like garajal heroic (3rd boss msv) back when everyone was undergeared, it was actually a pretty viable option. You do more dps than a smite spamming disc, and you do more sustained hps then ancestral guidance / vampiric embrace -ish cooldowns.
It allows for a pure hybrid role, thus only a very limited amount of fights are suited for it as ele. On live it requires a very specific mechanic (being stacked on top of the boss), but the new version will make it usable on more fights. But basically a fight where 3 healers will make you hit enrage, and 2 healers can't keep up with the healing; and you'd opt for a 2,5 healer setup, ele will win it from the smite priest, definitely if there is some sort of nuke phase.