The only people who have issues are people who've used Rust for less than a week and still do not understand the basic rules of the borrow checker. I've explained it many times to people already. Once you know the rules, it's easy peasy, and you'll never have another complaint from the borrow checker ever again.

The only improvements that I could see for Rust is landing non-lexical borrows, macros 2.0, and faster compile times, albeit compile times are largely fixed now. A 100K combined LoC project can easily compile a release build using 1 core in 3 minutes or less.