My merc puts them as physical buttons in the shape of a seat on the arm rest. Which works better than on the seat as you can see them and don't have to grope around to find them.
What else? Should screen brightness of your phone have a physical slider somewhere by the display? Your computer fan speed?
Why would this one-and-done setting saved per driver profile and synced across yours teslas require physical controls? It’s a nice to have but clearly not a requirement.