for warrior: depends on the fight. brayflox speed runs, i use flash, conva, internal R, feather foot, provoke. coil with a single target, i use conva, Internal R, provoke, awareness, second wind. feather foot does nothing against bosses, at least not in the new turns, and don't need flash, unless you wanna use it during pacification but its kinda minimal aggro that you could go without.

cross class skills really need a revamp to make them more useful and open up more customization in fights.