If you can't understand how torque relates to rotational forces then google can probably help. The benefit from direct drive assemblies comes from their mechanical simplicity, not from heightened performance. Not sure what your point is here besides that the most common type of vacuum cleaner is a "strange design."

The ones with belts tend to do a better job cleaning because you aren't losing all of that suction power to the brushes. And you can get a lot more torque out of a belt-driven assembly in general.

I didn't say it wouldn't suck, but you're still gonna survive. The human body can go like 50 days without food before it starts to get significantly weaker, assuming you can find water.

You can easily survive two weeks without eating anything assuming you aren't starting out emaciated, so it's not that surprising.

Quit it with your logic.