In reply to a tweet (local archive, Twitter) by @mrled

Micah R Ledbetter /mɹ̩ˈled/

@mrled

The claimed benefit of a burr grinder is precise control of the size of the resulting grounds. Spinning blade grinders pulverize the coffee so there is a bunch of grounds that are fine and a bunch that are coarse and a bunch in between. Burr grinders produce a consistent size.