After dwelling on why the Warriors are such a tough defensive matchup, I figured it out.
The Warriors do 4 things at an elite level: cut off driving lanes, close out quickly on shooters/role players, play the passing lanes, and challenge at the rim.
Their on ball positioning deters drives, their off ball discourages passing, the role players get spooked on the closeout and have to drive and finish or kick, and when all else fails Looney and/or Draymond are there to challenge at the rim.
Most teams don’t do all 4, but they do while getting back on defense and forcing you to play in the half court.
We have to accomplish one of two things to beat these guys in a potential Finals matchup, either Tatum and Brown have to go supernova (averaging 60-70+ PPG; why the Cavs beat them in 2016) or the team has to dominate the hustle department (OFF REB and FBP; why the Grizzlies give them trouble); of course, combining either with elite defense. Both are doable, but we have to do it consistently.