Can we please drop this? It's untrue, absolutely so. It runs on the old MoP Ele and the burst said Ele had. That Ele is dead and so is most of the burst it had. So keeping this argument up is kinda, irksome since said burst is gone. I read someone claiming that "Buffing Lava Burst would turn ele from a glass cannon to a glass nuke", that is simply and absolutely untrue. We currently aren't a glass cannon, we're just glass, maybe a glass figurine if we have a nice transmog set and we have about the same utility PvP wise as a glass figurine, none.
Ele Burst in MoP was not because of Lava Burst alone but came to be due to several different mechanics working together. Lava Burst doing decent damage, Ascendence doing very nice damage (which was one of the reasons why an elemental popping ascendence was immediatly CC's) and our old mastery. Partly also echo of the elements if skilled.
Pretty much ALL of these aspects are dead and it feels a bit as if several people set out to fix the former elemental burst on their own (without adressing our squishiness, how easy we are to tunnel, our horrid CC and so on in return) and then all these solutions where thrown together instead of a single one being applied.
1. Ascendence, please move away from the idea that ascendence let's you kill people, even if popped with other CDs on 100 it barely is a damage increase in a pvp environment. That is with all the backdrafts it had all along. Lava Burst hits like a wet noodle and the ascendence simply is not scary anymore. This alone would've done a lot to "fix" the elemental "burst problem".
2. Mastery, our old mastery was one of the biggest reasons why we had such scary burst. Being able to copy abilities and make no mistake it was quite a lot stronger than multistrike, that hit very hard allowed us to occasionally hit very hard when the starts aligned and lava burst procced several times over. This was a HUGE part of our burst, both outside of ascendence with lava burst proccs and during ascendence.
Losing this mastery single handedly killed the burst we used to have. Even the old ascendence without a high probability of hitting again for 75% of the initial damage would've been weaker by far. The new mastery does not compensate for this in any kind of way.
3.Echo of the Elements, a kinda wonky talent in the past, pretty useless now. Echo of the elements thrown in with the other abilities allowed for some pretty silly situations to come to pass. This is gone now also.
These are just a few of the changes, lower lava burst damage making lava surge less usefull, old mastery scaling very well with haste and so on and on are other things that changed since MoP. We're not a glass cannon anymore, not even close and a buff even a fairly massive one to lava burst wouldn't suddenly make us one again, nor would it solve a lot of other mechanical issues that have arisen with WoD.