[AnimalMuppet]

> The lynchpin of C++ are value-types. Such types should be copyable and moveable and the language automatically generates the necessary constructors and operators by default.

It generates constructors and operators by default. They may not be the ones you want, though. They will satisfy the compiler, but they may do the wrong thing. If the default thing is the right thing, then yes, "= default" makes it obvious. If you don't say, then it isn't obvious whether the default is right, or the default is wrong but you missed it.