> you now have significantly stronger runtime guarantees about your application in terms of safe and proper concurrency.

I agree, but I think many people assume that this is the only benefit achieved. The presence of the borrow checker and rigorous memory safety requirements allows the compiler to take substantially more advantageous paths in allocation/deallocation compared to e.g. C. The benefit attained is similar to the benefit of switching from C to very well memory-managed C++, except it comes by default.

This is a significant advantage even in code that is not concurrent at all. I feel like it's a shortcoming of Rust's marketing, if anything, that the safety restrictions are often pitched only in context of thread-safety rather than memory-usage-optimization.