Comment by pjmlp

They show a return to how fast compilers used to be, before C and C++ took over the zeitgeist of compilation times.

Eiffel, Common Lisp, Java and .NET (C#, F#, VB) are other examples, where we can enjoy fast development loops.

By combining JIT and AOT workflows, you can get best of both worlds.

I think the main reason this isn't as common is the effort that it takes to keep everything going.

I am on the same camp regarding build times, as I keep looking for my Delphi experience when not using it.