> C# is currently lightyears ahead of Java in every way

Let’s not claim things that can’t be objectively proven. C# does have much more features than Java, but that is not necessarily a plus in case of a programming language. There are features that are definitely better, but I am not bought that the whole would be.

Plus, ecosystem-wise Java is much bigger and much more open-source. The runtime is also better on the JVM-side, though this is offset by C# expressing more low level details.

Also C# is really meant to run on MS servers (Azur). Yes you can compile C# asp core projects on Linux, but the hell of dll when the there are many projects in a solution is quit annoying. Development experience in C# without Visual Studio is quite cumbersome.

Nope. This is the M$ == bad era thinking.

I've been doing C# on a MacBook with JetBrains Rider for years. Some code runs in Linux containers, some on AWS Lambda.

Nope, see you're using Rider, because VS4Mac and VSCode only offer a subset of Visual Studio capabilities for .NET development.

I rather do .NET than Java, but the FOSS story isn't as Microsoft sells it, hence why on our agency .NET is mostly used on Windows projects, and usually loses against Java or node in UNIX like RFP, even after .NET Core reboot, because of dependencies and existing enterprise tooling.