Why so much negativity? Are you aware that there's this whole side called "contracting"? Agile made it very dynamic - sometimes assignment is completed sooner that agreed because company's priorities change. Sometimes you stay longer because they need your help.

I've been to many gigs where burned out or incompetent permanent (!) employees made a complete mess almost running company to a ground. Incompetent leads, even CTOs desperate for a fix.

Yet, as a contractor you come and help the companies *

* there are incompetent or selfish contractors as well.