I really hat it when manufacturers try to use/abuse the code to hawk their latest wares. If Bussman thinks that everybody is going to replace all their fuse boxes, motor disconnects, etc., they must have caught that Mississippi Mosquito virus!
NEC doesn't cover or address temporary or maintenance lockouts- that's a matter for OSHA. OSHA say USE THEM.
It should also be noted that new codes apply only to new installs- so older enclosures, even ones that lack padlock hasps, are still compliant (code at time of install applies)
We've come a long way in ten years; it wasn't so long ago that there were no lock-out devices for fuses and circuit breakers.
I admit to violating OSHA rules on a regular basis. For example, I have purchased my own, rather than relying on my employer to provide an adequate assortment. In doing so, I am violating OSHA rules, which forbid this. So cite me! I also use my toolbox lock for lock-out purposes- another violation! I will do whatever is necessary to protect myself, even if the rules say "no."
I have also used zip-ties to secure lock-out devices. Something about a brass padlock swinging around in a hot box, or somebody banging into a swinging door (that the lock keeps from closing) strikes me as silly.