[Measter]

I can't compare with Java, but I can for C#. With Rust I find that I have much more confidence that I understand what the code is doing primarily due to the borrow checker and how Rust enforces unique vs shared access vs ownership. Just by knowing the types involved, I know exactly what a function could potentially do to what I pass in just by looking at the call site.

In C#, I can't tell at the call site whether a function could mutate what I pass in; not without looking at the implementation of the function and anything it passes that object to. With Rust, how it's passed in completely informs me about this. If it's passed by shared reference, it can't mutate. If it's passed by unique reference, it might mutate. If it's passed by ownership, then I can't access the instance any more anyway, so it's not my problem.