He has a good article on that at [1]

But here's the gist: sometimes you have an object you want to copy, but then abandon the original. Maybe it's to return an object from a function. Maybe it's to insert the object into a larger structure. In these cases, copying can be expensive and it would be nice if you could just "raid" the original object to steal bits of it and construct the "copy" out of the raided bits. C++11 enabled this with rvalue references, std::move, and rvalue reference constructors.

This added a lot of "what the hell is this" to C++ code and a lot of new mental-model stuff to track for programmers. I understand why it was all added, but I have deep misgivings about the added complexity.

[1] https://blog.knatten.org/2018/03/09/lvalues-rvalues-glvalues...

I find that this can reduce overall complexity. It makes it possible to use objects that can not be copied (such as a file descriptor wrapper) and moving can in most cases not fail. Without move semantics you'd have to use smart pointers to get similar results but with extra overhead.