No, electronic door handles are not cosmetic, they save a lot more lives than than they kill by people drowning or burning alive in their car because they are too stupid to read their cars manual.
Since you apparently do not know this, the purpose of electronic door handles is for the car to be able to lock you out from opening the door if there is a car or bicycle approaching from behind in your blind spot. That’s why you only see them in cars with blind spot radars
That being said, Teslas design is still terrible. In Audis the electronic door handle doubles up as the mechanical emergency door handle, you just need to pull on it harder than normal and it will engage the manual mechanism