I do think that with the more filtration that has been added to vacuums as "innovation", and then subsequently needing more and more high power motors to move air through those filters, the performance dropped off.
Antigue vacuums were basically like a leaf blower with a sock on it and that was it. They were made before OSHA laws were standardized so they had big motors and a direct funneled path to the bag, so that's why they were so powerful, but they did give off a dust cloud from around the bag.
I have a Hoover 700 and I do believe that it beat and pummeled the (30 year old) glue under my glue-down carpet loose, because when I walk on it it seems...crunchier than it used to be before.
Toddk13, is that Arco-Wand vacuum gasoline powered?