While this is true, all classes can use purifying rods, those have a recharge ofcourse. A long one. While roots can be spammed.
A good nt/fixer/crat/trader or agent will use this to the fullest ofcourse.
You stand there clicking free movements. The guy comes back and roots you again.
And goes away for 15 secs. Comes back and does the same again.
Eventually the zerg finds you and by then your defences are down and so you die inside a second.
All top roots have a duration of about 280 seconds. That means 4 clicks if you are using ql 200 FM's, and most ppl don't. Which translates into 20 seconds before you are free.
So saying that almost everyone can get out of a root in a matter of seconds just isn't true.