In reply to Etta:
From the live stream I would say that Nathaniel was no where near the bolt. Stefano was obviously very close and may have touched it but he did not use it. (And I have a bit of experience at deciding these matters!)
Removing spare bolts from walls, and just as importantly replacing them, is not very easy especially on permanent walls. In Hachioji (World Championships) the setters were able to remove lots of spare bolts that they knew they wouldn't use during the whole event but any that they might use could not be removed as replacing them would take too long.
The short term fix is to create a hold that can act as a bolt cover. Zero texture. There are already a couple of hold manufacturers looking into designing such holds.
The long term fix is to have recessed bolt hangers.