However, as we’d see for the rest of the Original Trilogy and even going into the Sequel Trilogy, these white-armored enforcers are actually terrible shots, rarely ever hitting their target.
So why would Obi-Wan say they were so component?
In Star Wars: A New Hope, Obi-Wan Kenobi informs Luke Skywalker that it wasn’t Sand People that massacred a sand crawler full of Jaws, but actually Imperial stormtroopers because the shots were so “accurate” and “precise.”