There is a decent amount of ruin spam but it also depends on how you want to do it. MP management is kind of a thing now if you want to maximize DPS due to Ruinga being a more hard castable spell even with the MP penalty, it costs 6x a normal ruin. Main reason is because lucid dream actually recovers a shit load of MP.
It is a lot harder to screw up SMNs now though bar some timing that still remains. Tri-disaster or I guess dual disaster now puts a + ruin type damage debuff ontop of the debuff so cast ruin types depending on it. Because Bahamut Trance resets tri-disaster it makes it so you in should not need to hardcast a DoT if you spread out Aetherflow and Bahamut Trances properly, of course single target only.
It is however not as hard as it is like it was in HW to maximize. You just have to be careful of a couple of CDs (pet included if you want to micro it) and MP management.