Sounds like a compiler bug to me. It is a valid reason to avoid them in some rare cases right now, but it doesn't make the feature itself bad

Those are ABI. Unless it is inlining them, the overhead is to stay.

	▲	usrnm 3 minutes ago \| parent [-]
		ABI changes do happen. gcc had an ABI change in std::string because of C++11. It was long and painful, but everyone survived, the world did not end