What is the reason for the weird syntax of the “case” statement in a bash/zsh script?

Question

Looking from a programmer\'s point of view then shell script is just another programming language, where one has to learn and conform to the rules of the language. However,

Answer 1

The reason of using ;; is that a single ; can be used to write multiple statements in one line, like:

restart)
   stop; start;;
...