...and the tools, space, consumables, safety equipment, cleaning equipment, training, and policies making on-site destruction possible.

I can easily angle-grind a HDD in two in my garage, where if I fuck it up no-one would be liable. But it would be quite involved to do the same thing in work, where if I fuck up they'd be liable.

Unless of course your rule is "diligently follow all security policies, but ignore and bypass workplace safety policies" which I would say is a confusing message to give your employees.

Of course, there's no excuse not to dd zeros over the entire disk and, (if it's an SSD) trigger a security-erase with hdparm.