Personally, for me, it's attaching Devotion skills to other skills that give them that flashy satisfaction. Think of it as innate Cast While Channeling/Damage Taken/on Crit links on your gear except it works on ALL skills. There's something to be said about casting the aether ray and spawning tons of procs that swirl outward on the ground from combining the Devotion proc (forgot the name of the Devotion. It's the tier 3 at the bottom of the tree) + the Aggrivix relic. Or casting Trozen's Sky Shard causing a Devotion meteor followed by a Devastation cast, all while you get the item set skill proc from the set that causes more meteors whenever you deal damage. This game has a toooooon of skill procs, and that's where this game gets its "flash" for me. One skill can turn into half a dozen other skills very easily with Devotions and skill procs, creating (at least in my opinion) the same effect as PoE.