yes but also no, In some situations "optimizing smart pointers" to just be a single pointer size (Box<[T; N]>) instead of two pointer sizes (Box<[T]>) or inste

yes but also no, In some situations "optimizing smart pointers" to just be a single pointer size (Box<[T; N]>) instead of two pointer sizes (Box<[T]>) or instead of three pointer sizes (Vec<T>) can make a difference. For example it can make a difference between passing values per register or per stack in some situations. Or it could make the difference of how many instances of the boxed slice fit efficiently into the stack part of a smallvec. Which if it's the difference between the most common number fitting or not fitting can make a noticeable difference. Through for a lot of fields of programming you likely won't opt. to do such optimizations as there are more important things to do/better things to spend time optimizing at. But then for some fields where C++ is currently very prevalent it might matter all the time.