Kinda makes perfect sense that SS is better for SMN more than any other class.

The vast marjority of SMN dps is non-CD based. You only really have Fester and Deathflare (enkindle too - but that is such a long cd it barely affects any dps) as non CD based abilities.

Compare to, say DRG with all of its off GCD being CDs, etc.

BLM probably affected similarly to us, but idk since I do not play that class. Well I don't play SMN anymore anyway, but =(

Important to note that as a model you can easily treat DoTs as big "nukes" with a CD the same as their duration. If you do this, you'll realize that our "CDs" scale with SS which no other class does.

Thus...SS is good.

Importantly I am unsure whether you can feasibly get enough SS to fit another ruin III into DT. It will be pushing it to be sure, and you cannot macro Deathflare if you want to last second it.