Mine is that the useState hook is an actual plague on the entire React ecosystem. Regardless of your opinions of React, if you wanna use something then use it right.
Async/await turns the concepts from the [CSP] (https://en.wikipedia.org/wiki/Communicating_sequential_processes) that are useful into an overcomplicated mess in every language that implements it, and golang is a prime example of how clear and intuitive an implementation aligned with CSP can be without requiring arcane typing and language infrastructure that comes with async/await approaches.