Your arguments fall flat. Could very well be that your language was the issue and writing a small proof of concept for the specific use case that's problematic

Your arguments fall flat. Could very well be that your language was the issue and writing a small proof of concept for the specific use case that's problematic in a battle tested language other people know is a standard trouble shooting step. Especially if it was a rare limiting error, that sounds like a trivial thing to be implemented in C with a simple for loop and some dummy data perhaps. Same with the OS. Only because socket functionality is decades old doesn't mean that you can't hit a recently introduced bug, that could have been fixed in a new version. That also is a standard troubleshooting step. It doesn't make for bad advice only because you're too lazy to do it.