You mean the rear caliper? Loads of bikes run them that way. Keeps it from competing for space with a rear rack.
And SHIT! I thought all the bikes with saddlebags 0.5" above the rear tire looked really stupid… I’ve burned holes in things enough times to know that nothing goes near the tire. I thought I was taking crazy pills seeing all the bags gracing tires all over IG.
This thing costs $65 less than the Erlen or Bagman or whatever, and it doesn’t bounce:
Even if you remove the caliper/fork leg interaction, I’m pretty sure the tire and disc forces in different planes will put torque on the hub around a different axis than the axle. A noodly fork would twist under hard braking.