There are some 'older' comm bldgs with the six switch being used, and it was ok when they only had the tenant capacity for 5 or six units. Now, they wind up paying the price to upgrade the service for spaces that they split for tenants that require 'less' square footage. The $$ savings for 'no main' catches up!
I just got plans for a new Taco Bell, and, yes, the design is for 600 amp, 120-208, 3 phase with a six switch MDP.
Yes, the prank shut of the main can be a problem, but there always is a breakaway padlock for a deterrent.