This is not entirely accurate from experience, sometimes I can slip the correct positional in if I'm quick off the mark on Ravana and my reading comprehension is on-point. I make a choice to go for that 90 potency at the risk of the KB and slow; that choice to 'push the boundary' is what makes the mechanic worthwhile for me. I stand in AoE all the time for that 90 potency (situational, but I consciously make the choice). Hell, I've thrown an entire Sav 1 attempt to the wind because I got the entire team resin bomb'd because I wanted that 90 potency; RnGesus gave me the wrong proc and goddamn I'm not losing to that Monk. So I guess it has some net effect (as opposed to none, which is being argued by many).
It's not 'difficult' per se - not much is with practice - but it allows me to make a decision; which I enjoy. By itself it's not complex, but sometimes if your DRG is a goon (like me) it has interplay with specific boss fights.