Excellent video!
Regarding the issue of snowplowing on bare floors: if vac-makers would reposition the placement of the brush-strips on “rocker-switch” wheeled carpet-floor tools, the problem would be solved. As Panasonic, Kenmore and Hoover once did, a single row of retractable bristles along the centre of the nozzle (with a break in the centre for the suction channel) would keep the tool at just the right height above the bare floor and allow dirt to be sucked in from the front and rear on both the foreward stroke and the back-stroke. Retractable brushes set around the perimeter of the tool are rather useless in my opinion.
Though the Hoover and Kenmore bare floor brushes were not wheeled, the concept could easily be applied to the standard wheeled convertible carpet/floor tools. Instead of perimeter bristles, install a single thick row of retractable soft bristles on either side of the suction port-hole - perhaps with a small set of edge sweeping “whiskers” on each end. This way dirt can be easily sucked off the floor from both the front and rear of the metal sole plate.