shadowmeld is interrupted by ANY DAMAGE too, didnt stop rogues and druids from using it in arena for their advantage, didnt stop any night elf in open world PVE AND PVP to not take huge advantage of it.
this ANY DAMAGE you speak of can easily be avoided with how classes are designed these days. you dont need the whole 6 seconds of it, nobody is going to use it on 0% of their HP and it doesnt matter if your HP doesnt end up at 100%. I dont want to see some Zanda troll use LoS and recover from 30% hp to 80% in 3 seconds while Im stunned.
I dont want to see the last remaining decent alliance players move their guilds to horde because ever 20 player of the raid can heal to full hp in a phase switch of a bossfight without spending 1 mana.