If you have not noticed a difference, then one could assume that you have alternated combo starters already, which would mean you have played the job wrong. That is just an assumption, and is not a criticism of you or your playstyle, mind you, just an objective fact to consider.
For people that did play the class right however (making a conscious note of the timer of Noxious Gnash, and deciding how and when to reapply it), they do notice a change in how the class plays, and that should be considered.