We use a lot of square bills for several reasons. They deflect well off of cover whether the obstructions are bottom oriented or higher in the water column like submerged trees. These are the kinds of places big ‘ole bass like to hang out to ambush prey.
That’s why squarebills tend to be so effective. They represent both some form of food for the bass as well as have the ability to draw reaction strikes. With the latter in mind, one of the key considerations is the ability of a lure to both get through clutter without hanging up and get back on track after banging into something.