Haven't played in 7.1.5 yet however with AS providing 3 insanity and s2m not being go-to anymore there is room for change. Spirit damage is almost negligible, it was mainly for extending VF (which is life or death with s2m). Now with that out of the way and with the tweaked base insanity generation for our spells for increased VF, we can use san'layn for the straight up damage boost. Also combined with misery you will be prioritizing VT over SWP for aoe dots
Yep, the nerf to insanity generation and no more need for tricking insanity is what brought it in line with SL. AS is still a viable talent, if you have lots of crit, but now crit is not valued as mucha s mastery, which directly buffs dot damage, hence SL.
Also faster shield generation (from artifact trait) is really nice. We were doing achivement run today, so I was doing lots of stupid shit, like taking the entire nythendra breath, or going all out on cenarius during thorns, and it was healing more then my (freshly buffed) shield neck.