I never really had an issue with cornering clearance with my shaft drive bikes, but of course this was back in the 80's before it became cool to lower bikes. Like Fired00d, I knew how to actually ride a sporty bike back in the day and didn't just sit planted in one spot, so I never had concerns with grinding the hard parts whether I was on the throttle hard or easing off in the curves. But the point is well taken; if folks don't know what they're doing and haven't practiced on their bike before going nuts, bad stuff can happen. Sort of like when guys on Harley's drop the suspension to look cool and then plant solid parts in the asphalt while trying to make a curve. People need to learn their limits and use basic sense, regardless of what they ride or drive.
Jerry