[nemetroid]

Correct, but except in very special cases, memory leaks are themselves considered bugs. Using memory leaks as an example of RAII not always working is, in my mind, similar to saying Rust doesn't prevent memory errors since it has the "unsafe" keyword.

[pjmlp]

Except when using system code you might have to pack pointers in OS IPC structures which don't map into smart pointers.

Similar to forgetting memory in Rust, and then there is no miracle RAII.

[nemetroid]

Yes, if you're not using RAII, RAII doesn't work.