I see the xclass skills are more or less mandatory, the real choice to do is how slot them and what put first when in low content (aka, some slot locked).

I'd chosen cleric as first and protect second, but still I see people wait for protect in sastasha lv16 after all of them see I've turned on cleric stance. Sure, I can protect then run thru all the menus and swap swap out and come back (in the while, tank is likely to first boss and locking me out XD). But.... Sashasha.... I can fill your hp bar healing with cleric still on... what you want protect for, there...