Indeed. I once had critical systems routed via a large redundant Cisco switch which claimed to be 1+1. Turns out there was a single "supervisor" component which

Indeed. I once had critical systems routed via a large redundant Cisco switch which claimed to be 1+1. Turns out there was a single "supervisor" component which failed (after just a year or two) and made the pair of switches useless. Apparently the designer worked in a team where nobody does anything when the boss is out.