If someone ever put velcro on my pedals I would call the police.
I put Soft side on pedal and Hard on Pedalboard so that the pedal board doesn't pick up and capture all kinds of nasty lint, hair, and whatever facing up between the pedals
But most of my pedals for my gig rig are bolted down directing using the threaded holes on the bottom plate so that they don't have any play when they are stepped on.
Usually it isn't the hook or the loop side that fails. It is the glue that affixes them to the pedals and board. It can't take the Florida humidity and heat, and leaves a mess behind.
It's good to learn that Dual Lock uses a better adhesive. Didn't know that.