That's not true. You cannot shift gears in the Model X, S, or 3 without the touchscreen - the only way to change into or out of park, drive, or reverse is to swipe on the touchscreen. Only the Model Y has a stalk and it is being removed in the next version.
Also even on older Teslas lights are controlled exclusively via touchscreen.
I don't know what to tell you, you are wrong. I drive a Tesla, I have specifically checked all of what I mentioned when I had this (in my opinion highly problematic) issue happen to me. Have you actually tried it?
All the controls related to driving are available. You can use turn signals, wipers, change lights, honk, shift gears, etc.
But you are correct that you don't see your speed during the reboot.