Stay a while and listen,
there was a incredible long cast delay for ele druids(Firestorm/Fissure) and it was only there to prevent lags/frame breaks due to its “complex” animation.
But after 20 years of hardware evolution it should be obsolete to cover this issue with a forced handbrake.
I don’t see any balance issues there(TBH there is no balance in D2 anyways xD), fire resistance/immunity is the most common in this game(NM+).
PVP should also be fine and you would see more ele druids there.
I have to admit that a Fissure spamming enigma druid sounds kinda tempting in PVP :o)
FareWELL