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Because even a swiftmend is a one-shot 5k heal with top gear. When tanks have 20k+ health, 5k can keep them from dying, but it won't keep the next hit from killing them. The spike-insurance comes from your direct healers who are spamming or cast-canceling heals. You can't swiftmend again in 1.5 seconds, you have to wait another 15(12). Another spike can occur in 15 seconds. You can't guarantee that swiftmend will be there. You can guarantee that your direct-healing tank healers are on their assignment.
Spike insurance comes from your 5k swiftmend, and the Flash(es) of light, the Greater Heal, etc. that are also going to land to fix a big spike (10k+) that puts the tank in danger.
There's also the factor that if your healing lead has you assigned to roll HoTs on certain people, it's not your job to go mavericking about, and leaving your assignment.
We get that you hate "lifebloom spambots".
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