Pretty much all servers I’ve ever worked with was multi-user. What’s even the alternative? A single account shared by all admins? That sounds like a nightmare from both a security and an auditing perspective.
Right, my response was primarily to the claim that “there are so few multi user machines in existence”.
As for trust, there are probably few, if any, attack vectors more common than privilege escalation, so I’m not sure I follow that line of reasoning either.