Apple can’t even be arsed to support games that were released on their own platform like 5 years ago. Why would they suddenly start bothering to support games released for other platforms?

Since you specifically mentioned C# : https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/coding-style/coding-conventions

I’d be surprised if there is a serious language that doesn’t come with at least some semi-official style guide. But usually they are not universally followed and everybody just does their own thing.