If only we could stop at single-threaded applications :-)
I'm not convinced modern C++ stops all issues with pointers/iterators and ownership either. But it's hard to tell because every large-enough application inevitable has to interface with legacy pointer code.
What it does do is make it easy to reason about how pointers are used across the application. Also worth noting that even with legacy libraries, you can wrap a given pointer with std::unique_ptr or std::shared_ptr and provide a custom deleter and maintain reasonable safety guarantees.
But I was considering modern C++ compared to, for example Rust. I'm not sure if the memory safety issue that Rust solves still exists as strongly with a purely modern C++ codebase...but then again I never run into those either.
For threads it's no contest between Rust and C++, although TSAN is pretty damn nice.