I guess we agree to disagree here ^^
Fair point for haste here. We only do four, so I dont really know how "drastic" the situation is for 8.We are popping 8 of those on Ilgynoth, and yes, haste does make a difference when using tranq there (there is always somebody who cannot seem to find the Barrier and healing circles).
My overall conclusion to that topic would be:
While hymn looks weaker on paper (720%) than tranq (1080% with trait I think), it is not healing wise due to all that stuff I said before. Utility wise it certainly is worse (moving while tranq), but in most cases it can be played around that immobility with planning. Sometimes not, but that hasnt happened often to me yet. That tranq legendary is strong and I would rather have something like that instead of a legendary that buffs our guardian spirit.
On Guarm:
I definitely know that you are a target for the breath so after the spirit rezz, one usually has a different color to go in for the remaining breaths.
Revival:
Id say it looks so weak because you see all the healing done at once, while for channeled CDs you cant distinguish between the CD and the other healers healing the raid. You just see how the raid goes up during the channel and think "oh that tranq / hymn /.. is really healing the raid up". Thats at least my theory :P