There are two kinds of complexity. Upfront complexity and hidden complexity. Rust with the borrow checker significantly shrinks the space of possible programs that can be written to solve a problem. Some people think this is bad because they can't write software in a way they find natural, I like it because of the possible programs that rust makes impossible to write the vast majority are incorrect and have bugs.

I also really like that when I use libraries, I know that all the library authors also subject to these same restrictions and I can trust their code much more than I could in other languages.