Realistically, the 'problem' is that many programmers today get scared away when you start mentioning monads or effect systems. Realistically though, the solution is to have first class monads or effect systems in rust and other languages. A lot of language design today is 'wasted' in the sense that we spend time implementing special cases (Promises in javascript, ? syntax in rust, async syntax in rust) without any thought given to the meta problem. In my opinion, the lack of attention to the meta problem is due to programmers being scared of such topics.