[wolvesechoes]

> Sure, but why not write it all in Rust or similar then?

Because it is clunky, ugly and unreadable mess. Which is something you may be willing to pay in some circumstances, but not while researching algorithms, doing data science, writing simulations etc.

> Though that is also code where a GC is a no-go entirely (the code is hard real-time).

There are GC systems with hard real time guarantees. There is more out there than just OpenJDK and Go.

Also, hard real-time systems rarely use runtime allocations, at least with off the shelf allocators.