just edit your post to go past the 1k limit. Editing a post lets you use the much larger limit of 10k characters.
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Why? Indom is an incredible ability on a reasonably short CD, pocketing it for a critical moment that may never come is a waste unless you are reserving it for a specific mechanic that's imminent. Why spend ~7.5 seconds topping a group between aoes when you can achieve the same thing within 2.5? Time is a resource too and being more efficient with it allows you to get back to healing the tanks or DPSing accordingly.
What content are you running? I'll hold my hands up and admit I've not bothered levelling SCH yet, but there's no way playing by your rules would be sustainable for Susano. Not to mention that it just doesn't make sense in my eyes, being flexible and able to quickly adapt to unexpected situations is a huge boon for a healer. Following rigid guidelines just isn't an effective play style especially with some of the quirky strats you see about EG: Lakshmi solo tank.
Lastly, take note of AlphaSonic's post above and consider doing the math yourself with a few logs. It takes an inordinate amount of incoming aoe damage before Soil wins over Indom, about the only example I can think of in current raid content is if people are flat out ignoring the lightning mechanic on Susano.