They do not have to be workflow identical. They just need to be equivalent. I can teach someone a different workflow and they will catch on with time. However if the new workflow is worse (slower, worse results, or other such negatives) that will be found out.

Now it will take power users several years to learn all the tricks of the new workflow and that is productivity lost in the short term. This alone may not be worth the cost. If the new workflow is better though it will be worth it.

> I can teach someone a different workflow and they will catch on with time.

And this is why a Photoshop user won't move to a new suite of tools.