I have a client that owns many buildings, two of which I visited yesterday to take a look at existing panels for jobs there. Both jobs have 600-amp, 3-phase, 208y/120 panelboards in them, series rated at 22k, being fed by mains rated 65k. I found 10k branch breakers in both panels, and advised them to change all breakers to 22k breakers. This client got a second opinion from another electrician who told them "it doesn't matter". What advise would you give my client?