In the Deal line item editor (where you create the pricing table for a quote) once you press save, there is a pop up that asks if you want to update the deal amount to match the grand total in this editor feature. [Like This]
In my company, the answer is ALWAYS yes, update deal amount!
At the admin level, in settings, I think it would be helpful to have a toggle on/off button where the admin can choose to ALWAYS update the deal amount. If on, the pop up asking each time a user in our HubID saves a line item in deal record would disappear and the deal amount would just be updated.