What if it's a large project where you have to do all these things? Would you run ten different language runtimes, each with its own garbage collector? Would yo

What if it's a large project where you have to do all these things? Would you run ten different language runtimes, each with its own garbage collector? Would you pay the cost of marshaling and unmarshaling data at the boundaries? What about training new programmers to understand and extend your system? What if you want to move some functionality from one part of the system into another, can you do it easily? Etc, etc. There's a lot of value in adopting one general purpose language as a company-wide standard, like Java. It doesn't have to be an excellent fit for every task, but it has to be adequate and not have any major flaws. That's harder than it sounds. I like the Rust approach (memory safety without GC), though Rust itself might not be the best possible realization of that approach.