We're talking about language design choices not ecosystem. Even still, libraries are not a problem. Nothing you can't do in C#. You should check out Rider.

We're talking about language design choices not ecosystem. Even still, libraries are not a problem. Nothing you can't do in C#. You should check out Rider. Bazel and Gradle are cross platform as well. Flight Recorder is good. I'll give you that. The .NET debugging tools are top notch...on windows. JFR wins out handily until the Linux tools reach parity. Though, again, this is all ecosystem and not language design.