Versatility/Mastery would be nice, even if it'd ultimately just be treated as something you're forced to stack and play around ("Oh no, even more of my contribution is dependent on having a 99th percentile BiS SAM in my party!"), as would having meaningful GCD tiers again.

The other major factor for me, though, is just wanting to see each point actually be able to do something, %-wise. By end of this expansion, a full-SkS build now, even with a 20% Greased Lightning and 13% Shifu instead of the 15% and 10% of old... still almost certainly won't be able to hit as low of GCD numbers we could already do in Heavensward and Stormblood. There's just less palpable impact from our stats than we used to have (and, imo, should have).