it's both
further...if you watch teams w a bonafide threat at wideout you notice his gravity ie how the defense adjusts to that particular player. can lead to miscommunications/broken coverages that leave guys running open (not saying every wr who gets wide open is due to busted coverage, sometimes you're just in the perfect playcall, but it helps)
however i would say our pass concepts appear less sophisticated than other top teams, using last game as an example (and there are plenty more) there are just a lot of route combinations that dont contribute to/enhance each other...and some that just don't make sense. like allen in a 3step drop from shotgun and theres 3 verticals that nobody is even looking back for, think it was 3rd quarter pats game. kind of stuck out in my mind that play...and again how much of that is on offensive design and how much of that is due to relative talent of the pass catchers isnt totally clear