> That sounds hard in any language.

Yes, it is hard in many languages, having experienced it first hand. Just wanted to point out my experience with Elm (I know) 200k loc, I can refactor the codebase fearlessly, knowing that once it compiles it will "mostly" just work.

I fondly remember porting Elm 0.18 to 0.19, which was a big change in the language itself and the libs, me and my co-worker working across time zones almost 24/7 for over a week to make the damn thing compile, it was like struggling in the darkness, unable to see "anything" in the browser for like 7 days and when it finally compiled.. it mostly just worked!

It's sad that to see Elm getting so much negative publicity, but I do enjoy working every day on it.