This is a complete non-answer. I'd assume that they know that Haxe isn't as popular as other languages, but they're asking about people's experience with Haxe, not looking for recommendations on which language to learn.
There's a huge genre of blog posts and Reddit threads where beginners tell other beginners which language is best to learn to get started with programming. My guess is that OP mistook this thread for one of those.
I used Haxe in the past. While it isn't necessarily modern usage I'd agree with the parent comment and suggest either Rust (using the WASM target) or TypeScript.
Compiler ergonomics are important for me these days.
