I'll man up with you on a hike or bike ride anytime you're up for a challenge John.
but I won't ruin my body to go along with your poor understanding of physics, and reality.
Be kind there Michael....
Let's back up
In the 1970s to through the 80s,
Prochem (and a few other companies) sold machines that used 3 MVL vacuum pumps ("blowers"). Those units with those blowers couldn't produce much airflow, so 2" vacuum hose right to a wand that itself was 2" or nearly so was critical. Put an 1.5" lead hose on one of those, and you really noticed it.
Cleaners who bought other brand machines with larger blowers could use reduced diameter lead hoses and not notice too much difference, except for long hose runs and water damage restoration.
That said, with a
glide and a wand with reasonable ergonomic features (none are "perfect" in that regard), cleaners can use 2" to the wand, and enjoy the benefits that the additional extraction and drying potential gives them.
If you look deeper, though, there are other issues that create sub-par cleaning performance, slow drying, odors, wicking etc.
1. Wand design: The "classic" dual jet "AW29" wand really can cause wetting issues unless you redirect the spray at an angle.
2. Vacuum Leaks: Few units come into my repair center without some damage to gaskets in the recovery tank. Too few cleaners keep their gaskets repaired, and when needed replaced.
3. Vacuum Restriction: Does a 1.5" vacuum hose interfere with performance? Sure it does. But not nearly so much as clogged filters and strainers in the recovery tank. Most that we see here are, if not loaded with debris, at least coated with enough to massively interfere with performance.
4. Technique: The people who participate here understand the value of "dry strokes". Few understand that to many cleaners, the trigger is something you release when you pick up the wand to move it to another location.
In my view, these four issues probably cause more performance problems that the diameter of the vacuum hose used at the last 15-25' to the wand.