I agree that it is important for faster drying to be able to remove the solution immediately, rather than go back over a cleaned section much later with a dry stroke. By the time you do that, the excess moisture has sank into the carpet already.
I would like to see a tool or wand that had a front and rear vacuum slot with jets in between similar to the zipper but with the vacumm slots closer together. That way the solution would be picked up quicker on the forward stroke as well as the backward stroke when cleaning in both directions. It would seem to me that the carpet would be dryer if this were so. I may be splitting hairs here though.
I repositioned the jets on my 360i quad to make sure the solution was picked up immediately. For some reason the Rotovac is shipped with only 2 of the 4 jets positioned this way.
On occasion I do use a wet forward stroke, but within reason and I do not deviate much from the pattern I mentioned earlier.
Also agree that my friend’s wanding technique is hard on the body. You should have seen him sweat.