Agree and disagree JPS.
I hang off a bike on the road because the body position gives me more control and feel. I get through a pair of sliders every summer simply through road use irrespective of track days - not because I treat the road as a race track. If I didn't hang off, I would generally be at the same angle of lean and at the same speed without the benefit of using my slider as a gauge or the confidence it instills. Whether you hang off or not, (even if you don't attack a corner) and hit oil or God forbid diesel and the bike is leant you're into the weeds regardless. With your knee down there is at least a remote chance of saving it.
We have to adjust our style on the road and often compromise lines to survive, but I see nothing wrong with grinding around a shell grip constant radius corner on a set of street/sport tyres with good visibility on a country road.
Treating the public roads as a racetrack is an entirely different matter - particularly since those that do often endanger themselves and other road users through an over estimation of their own capabilities and I agree completely.