Most of the time the cost is not worth worrying about.

Most of the time you don't need to think about move or copy - the compiler does the right thing for you. When there are exceptions it is generally when you need to disable them which is simple enough. When you think about constructors you only need to think about the local class in general, and not how they interact with the larger world.

constructors and destructors eliminate a lot more complexity than they solve. They enable RAII and thus clear ownership of everything (not just memory!).