I'm gonna be nasty now: play clean and you'll be able to play all those beefy chords, major 7's, 13's, 6/9's... mmmhh, jazzy colors I mean. No, not needed; everything you play is you, whatever you play. I got used to these jazz kinda barre thingies, that may fit together with EVERY style of music from moody pop to blues (remember those dominant 9's that Stevie Ray used?). I just wanted to say, it's boring to listen those power chords all the time, though they do have their own function and they could be exciting when they're not overused.
(Some little thingies I played.)