Not irrational at all.I'm not opposed to metal roof, but I don't have a way to cut it. And this might sound stupid, but my coop is at about face level, and I have this irrational fear that one day I'll move too quickly and slice my head open on a metal edge.
It's totally likely in my opinion.
I hung wind chimes and planters on the corners of mine to force a step away from those corners.