While I 100% agree that it would be best to allow system admins to customize whether commit dates are used in the system as stated in this initial idea (https://support.workfront.com/hc/en-us/community/posts/115001085547-Give-system-admins-an-option-to-...), I still feel like one of the issues here is customization of the task page UI.
Maybe Workfront can make this minor adjustment while we all wait for that bigger one to get planned now that it has 50+ votes.
When a user navigates to an individual task they see that commit date as the ONLY date under the assignments section. This is one of the biggest points of confusion end users have complained about consistently and no amount of training has eased this pain.
If the task page displayed a side by side comparison of DUE DATE vs. commit date, I think that'd make a lot more sense to users. This should be a minor enhancement that actually provides a lot of bang for your buck. The simple act of placing these two next to each other on the task UI page should immediately help clarify what the important date is.