is smoking crack. .NET on Linux has been fine for years. Unlike Java there is no need for a .NET Kotlin (and there is F# if you really want a functional-first .NET language). If you want to call Java a "better" alternative to C#, power to you. But Javascript and Go shouldn't be in the same conversation. Hence the crack.
Might be thinking about .NET Framework, which is a pain in the ass to deploy. Modern .NET is completely different. Can't think of many instances where the language itself works against me compared to Java.
So you can conditionally compile code based on build-time constraints. For example, debug logging code can be removed entirely in the release build.
Has a point, but this also disqualifies them from using almost any language with asynchronous programming.