No, as in some instances you may wish to do the same thing for two case statements, so you need it to fall through case1 into case2.

In other situations, you really don't want it to do that, so a break is required.

How would the compiler know the difference? Note that you can't "fall through" cases in Swift, and it is irritating. It stops you using the same code for two case statements - you have to duplicate it or put it into a function.

Not with nested switch statements.