You don’t need to find the horn button to use it, you can just put your entire hand over all the buttons of the right side, just like if you pushed the traditional centre cover. It works exactly the same except that it is a bit on the right. Doesn’t seems to be a big deal here.
Regarding the shift backward thing in case of emergency, well, I don’t think using the stalk is going to make it quick enough all the time anyway, plus you have to check in your mirror to see if you are not going to hit a pregnant lady right behind you. If you want to solve such situation, ask Elon to implement an feature that would automatically detect potential collision and back off the « only if » there is no obstacle behind..
Think out of the box and try to see the big picture, if you think Tesla engineers are doing such bold moves just because it « looks cool », you have it wrong.