Shouldn't the Preview button only available in the last step (and not in all intermediary steps)?

There is this preview button which appears at all step of a complex workflow. However as there is no "undo" mode and no track of intermediate changes (ex: when performing some quick correction during a complex workflow), the preview button always launch the same rendering.

In such a case wouldn't it be more simple to only list it on the last step of the ongoing workflow instance (and not on each sub-intermediate step). One is guessing to find the difference and typo correction occured during each step which is not the case presently.