I have a 2012 Covert, I will assume (perhaps incorrectly) that this is the same as the 2013 drop out arrangement. I quite like the standard bolt in option as I can screw the axle in lightly thus giving very little side load on the bearings (Hope Pro 2 hubs) and then the locking bolt goes in tight for security.
Similar method to the Fox 36, 20mm axle were the axle winds in lightly and held secure by the QR levers on the fork legs.
Will using a QR axle potentially encourage more / unnecessary side load to be placed on the bearings?
As Shimano hubs have a different bearing design they can with more side load and the bearing seats are angular. I have to point out that I have not seen inside a Shimano hub for more than 10 years so things may have changed
I have seen reports of Hope hubs (that contain plain bearings) failing prematurely, where I have never had an issue with Hope hub bearings other than reasonable wear and tear / water ingress over time. I have usually attributed this to over tightening of QR’s.
Of course this all may be complete nonsense, I maybe thinking about this too much and will be happy to be corrected as I may learn something.
🙂