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The other big C# ecosystem is Unity Engine with its own frameworks and plugins. It lags a bit behind Windows, and might be one reason why some C# developers seem to be behind the times when it comes to new language features.

Edit: The other reason Unity developers are careful around new language features is avoiding memory allocations. When you write C# like it was Java it's more straightforward to see where allocations happen but it's all too easy to accidentally write allocations in your main loop if you use everything the language has to offer.