Looking at a this buttons recommended footprint, I found these irregularly shaped pads:
The protrusions from the pads are way to small to act as solder thieves, and the button itself has gull wing pins that don't mimic the form of those pads in any way:
What is the purpose of the odd shape of those pads? Is there any reason why I shouldn't just draw those pads as rectangles on my PCB layout?