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The original concept of Spirit Link comes from WC3, as horde is balanced by having "AoE", Slow, Healing, while the other factions have "burst healing". Therefore, other factions could just focus fire horde units for an easy victory. With spirit link, the focus fire is distributed and horde's AoE healing is more effective.
The only way to balance this would be to sever the healing efficiency of the shaman. Surprisingly, what is happening is that we are becoming better spike-dmg healers, quite the opposite. Not that I would complain, for I think we need more tools for our trade.
On the question of requiring a resto shammie in 25-man raids... keep in mind that for SL to be up all the time, assuming a mechanics I posted before, the tank would be getting hit for around 60% (a bit less) of his total HP. The presence of a resto shammie would distribute this healing, making this spike dmg easier to heal. But...
1) If the encounter is designed such as to also provide lots of AoE dmg including to melee, SL might be a good idea sometimes OR not. So balance could be achieved by dungeon design.
2) Holy priests got also a 51pt talent that, coupled with their core talent taht gives them 30% of their total healing to the tank, so they would also be able to deal with the massive spike dmg necessary to make tank healing challenging with SL (60% hits). They also get mana back based on their total overhealing, so this is really shouting that priest will overheal much in WotLK.
To sum up: A resto shammie distributes the damage the tank gets, converting spike dmg into AoE dmg. But in AoE heavy encounters where the tank ALSO gets spike dmg, SL can be detrimental to the raid.
ALSO: While we distribute the dmg, the holy priest simply OVERHEALS it. Two ways of facing hard hitting bosses. And we can assume that a 25-man raid will demand either a holy priest or a resto shammie. that's pretty much ok to assume.
after all, balancing SL isn't too hard. But yes, we would be pretty good for small scale encounters, but keep in mind we had our share of difficulties compared to priests and druids (H Crypts, 1st boss).
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