Different name mangling between different compilers is deliberate, and a good thing: it stops you linking together code that uses incompatible ABIs, and then getting strange crashes.
Now, if you want to complain that it took too long to standardize ABIs for C++, and that it's too hard, and that they're not stable enough, then you might well be able to make a pretty strong case, but that's a different thing. If your ABIs don't match, you shouldn't make your name mangling match.
(Incidentally, if you code in a sane way then the implicit copy operations _almost_ always do the right thing. It would still be better if we had to explicitly enable them, but that would have broken C compatibility, or made struct vs class into two different worlds.)