For what it's worth, that's what arm guards are for. Why do you suppose that Byron Ferguson, Howard Hill, Paul Schaefer and all those Oly shooters use/used armguards?
While it's true that by canting the bow and bending the arm you can mitigate string slap, you do so at the expense of form. The problem with a bent arm is, your drawlength is always changing. The result is, accuracy suffers, because, changing draw length changes POI.
Besides, it's really Trad and one more way to distinguish yourself from those evil wheelie guys... :D