wont be widening the reach of the card (if you were to only argue to expand it to gravity, that would be one thing, but to everything is a really boring/bad idea), too many potential applications which would be beyond the scope of the card.
not to mention there was already a momentom on a stick card without elemental restrictions that failed to progress through voting.
the limitation is what makes the card interesting, without it i may as well just call it "shields why bother?"
and i disagree with the "only water with a splash of gravity will be effective with this card" remark. a duo deck using flood (top/bottom control), otys (middle control), gravity shield (that which cannot be eaten), puffer fish(or)crawlers(or)
dragons (offense to be momentum'd) and this card would be an even split between the two.