in the WCA (world cube association) there is no significantly time consuming event in the WCA with MBLD (multiple [3x3x3s] blindfolded) taking the longest.

5BLDWOF (5x5x5 blindfolded with one foot) would make a very skill based and interesting event to add to the WCA and would also be the most time consuming event meaning the competitors not competing in 5BLDWOF would have significantly more time to practice.

5BLDWOF would also make way for even more interesting events as people could do other cubes with other limbs blindfolded as well