that very well could be your experience.
it's definitely not mine, nor other concert photographers I know.
Ditto.. It probably does not matter much if you can get it to lock at F/3.5 and up. Try putting in on a brides face at F/2.8 and have it lock on her chest because you cant see where to put it...totally sucks.. you can guess. Sucks if you want to shoot shallow and not be able to put the focal point where you want it.....you can work around it,, But WHY !! Just fix the darn thing,,,,stupid design here. Obviously an engineer that has no clue to real world situations designed this... other than F/8 and the black boxes in servo.. this camera is darn near perfect. Love it.