Why do iPhone case like Otterbox have the Apple logo exposed on the back?

I dropped my iPhone with an otterbox case on rocky surface and everything but the area with Apple logo is scratched

Just so people will know that you own an iPhone. Sad to hear that your phone got scratched but what else can you do.

For all those people that want too see the logo. My way of thinking is this. I know what's under the case, I don't need anything uncovered so other people know what I have, or have anything unwanted touching the phone through an exposed vanity hole, be it sand, dust or water, if it's a waterproof case.

Aesthetics mainly.

I'll design my own case with an Apple logo engraved on the case itself. 3D printing is awesome. I'll print in polyurethane for impact resistance. I will also make a cushion out of silicon to further absorb impact force