I totally agree with this. I would often raise my shutter speed to 1/800 at concerts, if the subject takes a lot of space on the frame. Othervise, I might go down to 1/250 or even 1/180.That is unless I want to capture the feel of motion in IE a drumstick. I find that for my style of shooting, motion blur tends to be much more cribling to perceived sharpness and - more important - emotional expressiveness, than high ISO is.
I shoot for fun, and my concert kit would be an X-E2 with either the 35@1.4 or the 60@2.4. I miss some shots with the focusing speed of this kit, but I tend to come home with some fine shots still :-)
(edit: I mostly go for a black/white end product)