Teams can just clog the middle and force them to either shot a 3 or settle for a long 2. Johnson "solved" some of that last year since his 2-point shooting and Off Rbd was so good, but with 2 of Meeks, Hicks, Bradley in the game the lack of spacing causes problems.
Last night notwithstanding, Duke has sort of similar problems especially when Tatum is at the 3. Some of that is "solved" since Kennard has played like a NPOY all year and Tatum can get into the lane, but the spacing has been a problem.