Simple, most people's drivivng style doesn't require it.
As long as you don't use boost 30 seconds before turning off the car, there's no issue.
I for one never use boost while driving the 2 minutes through my neighborhood on the way home or atleast a minutes through the streets to get to work. Even if you stop at a rest stop off the highway, ususaly yolur slowing down for 15 second and by the time your ready to get out 30 seconds has past.
Unless you are really boosting hard there is no reason to wait more then 30 seconds after using boost.