One thought before sleep… why is management changing so slowly ?

Midnight is passed… I’m reading some pages of the book “How to Change the World” of Jurgen Appelo… and I’ve found just in some lines the sum up of my feelings…  I share it with you, to be your thought for today, your thought for tonight:

“W.  Edwards  Deming  wrote  decades  ago  that  bonuses  are  bad  for  business
[Deming  1986].  But  most  managers  around  the  world  are  still  using  them.
Peter F. Drucker    said    ages    ago    that knowledge    workers    cannot    be
subordinates of managers [Drucker 1974], but managers still act as if they are
other   people’s   superiors.   And   research   tells   us   again   and   again   that
performance appraisals don’t work [Bobinski 2010]. But many managers keep
relying on them as their primary evaluation technique.

Why?

Why is management changing so slowly (or not at all)? “