Sounds like a good idea, but the best place to suggest something to Apple is
here→Product Feedback - Apple
This is a user-to-user forum, with minimal Apple participation.
You CAN create a Focus to be active automatically when you are at a location; for example, I have it enabled for my gym. You could also add one for your doctor’s office.
If you have an Apple Watch, when you reach the destination you can press the oblong side button to open the control center, choose Focus (the crescent moon), then Do Not Disturb, and then scroll down and tap Until I Leave. This will enable DND for both the watch and the phone.