Wayne
They are just another tool of the trade. The procedures are the same as when cleaning with a "box and a wand". You don't have the lost energy though of the hoses. But they never seem to be spec'd to high end porty standard.
The agitation is of benefit but personally, I would always agitate immediately after pre-spray application to gain most benefit.
IMO, these machines perform to their best in wide open spaces and because of their bulk are best suited to being resident on-site. Also, probably a little easier for the lesser skilled technician.
Yes, I would probably prefer to use a rotary pad system in this environment or even perhaps a TM if access and security weren't an issue.
Safe and happy cleaning

The Ken