It depends on the soil load. If heavily soiled it's going to take several cleanings to bring it back to acceptable level.
Light to moderate soiling you can clean some sq/ft. Yes at least at encap rates.
High level "appearance" while recovery water looks pretty dirty, it's not much solution pressure. The cylindrical brushes do most of the work. Although it looks good it's maintenance type cleaning.
If you're maintaining accounts it should work great for you. If you're wanting it for a once a year corrective cleaning, probably not the best choice.
Idiot proof type cleaning. I have 18-20 year old female students cleaning thousands of sq/ft with them.
I have my reservations on just how soiled the method can handle, I have a trucking company office situated on a dirt
compound to clean coming up. Poly glue down, grease, dirt and dog hair, if it can handle this it can take some office workers 20 stories up. This is my thinking, encapping is great for commercial and large areas but at some point an extraction needs to take place. I want to combine a 10gal 70psi trolley sprayer of ebay, wave vacuum by windsor,
crb and windsor clipper and market high rise office buildings. All second hand of course, I realise the capital outlay would put anyone off going this route and instead go cimex or the like but this is what I find intriguing as I don't know if anyone is trying this method because of exactly that. The clipper by my calculations should be realistically able to push 2000sqft an hour including filling and dumping. No portable can match that and as you pointed out it takes very little training to operate. The wide area vacuum performs the majority of the heavy dry soil extraction and in a fraction of the time an upright would, the battery 10gal trolley sprayer most likely only need to be filled up once and have some high ph prespray to really dislodge soil,
crb to grind it in and the windsor clipper to flush it, if other steps are done right 100psi should in theory just be rinsing out the suspended soils, I mean that's how much pressure carpet was cleaned back in the day, I figure with a 2 man team a portable realistically can do 1000sqft an hour, if you can double that why not? Plus the windsor has the added bonus of having a front quick connect for an upholstery tool or single jet wand for tight areas, throw in some office chairs and protection as an add on.