I generally agree, but really now, clipping one GCD during ice in a 8min fight is nothing. Your normal damage variance is larger than that, and critting once over your statistical average nets you more DPS than that one Manashift loses.
SMN does lose out on a Wyrmwave by using Addle and maybe has to use Ruin 2 instead of 3. If of course every needed Addle lines perfectly with Bahamut that's a different story.
