It doesn't take much for that damage to occur. The area was actually reinforced soon after Mighty was launched.
My Mighty broke in that spot with a simple face-plant on a table top. No 'drop' at all! This doesn't affect performance at all. Mine has gotten worse over time and bumping around. I've actually trimmed it back farther so it's not a sharp spot. When a lot of the rib is missing you do have to watch fingers to not get burned by touching a hot oven exterior!
Silicone sleeves as buffers would be nice, but be careful and don't add much of that or the cooling function of all Mighty's fins will be reduced.
The area(s) around bowl to also be careful with are the raised portions on top of Mighty, right where cooling unit locks in. Keep it all clean in the track where c/u mounts (and underside of c/u that contacts the o-ring) so there's no added pressure when installing or removing c/u. And as
@ChooChooCharlie has wisely suggested, slight (direct downward) pressure on c/u while mounting it on or off of Mighty. This pressure will be absorbed by the o-ring and cause less pressure to be exerted on the Mighty's housing.
The raised areas on top of Mighty were not raised areas in the original Mighty design; they were added as reinforcements to the housing thickness.