The 12.0.1 and 12.0.4 of the Wizard has built in step navigation bar. We have the option to click on it to navigate directly to that step. There are times when I'd like to display the step but not allow clicking on the step to navigate. ie. required fields
Also, the user can bypass any action framework built on the 'Next' button if they click the icon it's self which is problematic. Being able to lock the steps directly from navigation would prevent that but it's still nice to see the navigation bar.