It has amazing coroutines library and it started with a nice set of features but failed to evolve. Sealed types are a joke compared to union types in TS. No inline types so you’re forced to created stupid data classes everywhere even if it’s used only once. Constant fight between wannabe functional programmers that try to replicate Rust’s Result monad, but without official language support, and exceptions crowd. Static delegation. Still no pattern matching when even freaking Java has it nowadays. Hilarious. Constant focus on KMM, even though language stagnated for a while.

Rust is just a pain to develop. Slow to compile and constantly have to please borrow checker. I’m not sure if you’re joking, but you can’t seriously think that Rust is better language for prototyping than JS/TS.

> designed much later and not so hastily, so they have less warts than JavaScript as a result.

That’s irrelevant. Modern JS has evolved over the years and is a joy to use now.