This is over simplification of the problem. Do not disturb does not have a supervision control element. It is as good as putting your cell phone on silence. It does not have monitoring information on acceleration, deceleration and other monitoring elements.
The key of Bsafemobile and Fleetsafer is the supervision and control element of the administrator. If you are driving a loaded a heavy-duty truck and you text and drive, you will be fired. If your teen is texting and driving, you will be notified as a parent.
All that needs to be done now is to buy heavily tomorrow, rather than coming up issues that have no value.