That Ovation is actually the one I was thinking of too.
I agree on the setup being easier with the upright machines.
Yes, agitation is probably a big reason too. Although, some of the canister style machines did have motor drive brushrolls either included with the unit or as an add on, I know Bissell and Kenmore offered and of course Rainbow does sell the Aquamate.
The main issue with such a motor driven brush is it makes setup even more complicated if the hose isn't a direct connect setup. It is awkward with the solution hose and power cable having to be strapped to the hose during use and having to be all removed when changing attachments.
Upright cleaners are a lot easier in that way. But of course I don't know of any upright carpet cleaners that can be used as a regular wet/dry vacuum as well, in the way that many canister style cleaners can/could.
I was surprised to see Vax in UK still offering that 3 in 1 cleaner that looks very much like the orange and black version that was sold for so long. We even had them in the US for a time, although they don't seem to be as prevalent as Bissells steam cleaners. They still seem to use those same rectangular tools too. Wish we could get new ones here.
