Yeah, the main reason I'd ever cap on empowerments in Legion was due to OI bracers and getting crazy procs, or the Incarnation AsP buff in conjunction with OI or other sources of AsP generation. Pretty much all of those are gone or nerfed in Legion, so the chances of capping on empowerments is very slim. Maybe high movement where you only have time for casting Wrath for some reason, but that'd have to be a lot of movement.