This is incorrect. I participated in the committee discussions around launder, byte, pointer provenance, and implicit object creation. None of those issues show up here. This is a very simple case of using placement new into a properly aligned char buffer to create an object at that location. This has worked just fine since C++98 and is not impacted by the many other object/lifetime/pointer issues that are being discussed.

Additionally, implementers are in completely agreement here that this works. There are zero standardization/implementation concerns with this method, and I would highly advise against scaring users away from it when necessary.