I’ve spoken to several customers over the years who have mentioned that they vacuum hard wood floors before they wet mop. I’ve asked many of them why they don’t dust mop the floors. Usually the answer I get is that they’re just used to doing it that way. Occasionally they say that they don’t believe dust mops do an adequate job of picking up pet hair, dirt and grit. I imagine them using their upright vacuum or a small battery powered vacuum with no brush. It should go without saying that they’re not using a commercial vacuum designed for hard surface floors.
In the interest of full disclosure I have been selling dust mops my entire adult life, as did my father and my grandfather. It’s in my blood. When I clean, I use them. I can’t imagine why I somebody that doesn’t have a vacuum designed for hard surface floors wouldn’t use a microfiber dust mop. The drawbacks to using a vacuum seem obvious, I can think of three just off the top of my head: