What is the purpose of std::aligned_storage?

Question

If I understand it correctly, the main advantage of the std::aligned_storage is that it manages the alignment. Also it can be copied with memcpy() and can be used with POD types.

But!

1) The POD types are aligned by compiler by default and we can override this compiler's alignment using #pragma pack(push, 1)

2) We can copy POD with memcpy() by default (we shouldn't do something for this ability)

So I don't really understand why do we need std::aligned_storage?