Oops, I forgot to mention another reason handrails are neglected here, at least on the stairwells. They're usually dangerous - poorly installed and not too securely fastened.
It happened to me once on the first day of the school year in the brand spanking-new building on the brand spanking-new campus. I lightly placed my hand on one and it fell to the ground.
There was a cleaning person who watched this and, of course, giggled.
Now imagine you are that cleaning person, and you're thinking, "Right, if I clean that thing and it falls to the ground, who gets blamed? I think I'll go swab the floor for the 84th time this afternoon."