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> it's insane to write your own language > switch to Java or kotlin

ah yes rewriting in a new language, the classic not-insane approach

I offered several alternatives and I made it clear they belong in a spectrum. Don't make it sound like I claimed it was binary.

If the options are "Keep writing in Scala", "Port to Kotlin" and "Write a Scala compiler", the latter is clearly the worst and most costly of all.

Porting a large codebase can easily be harder than writing a compiler, many companies have codebases much larger than a reasonable compiler.

It worked out for Facebook and PHP so maybe that is why they want to give it a try.