Because you either invest in language features or editor features. I agree but most languages are built by single persons or very small teams. They have to sel

Because you either invest in language features or editor features. I agree but most languages are built by single persons or very small teams. They have to select their battles. The last languages developed with that in mind were in order: TypeScript (essentially only for editors), Kotlin (developed by an IDE company) and C# (developed in a HUGE team including a huge IDE team next office door).