Well, the headaches are pretty minor: Bosses who want to cut headcount without layoffs can do so by just not replacing people who quit - if nobody's quitting,

Well, the headaches are pretty minor: Bosses who want to cut headcount without layoffs can do so by just not replacing people who quit - if nobody's quitting, that's not possible. Things like training schemes might have been sized on the assumption you'll have >100 open positions in a year's time, when these 100 trainees finish the scheme. Firing them instead is not good for anyone involved. Bored star employees can't move teams if other teams don't have open spaces. And some people think constant employee movement stops teams becoming 'stagnant' as job hoppers sometimes bring in experience, ideas and methods from outside.