Why does Unity use .NET 2.0 when Mono supports .NET 3.5?

Question

Unity uses Mono in order to achieve multi-platform compatibility. Because of that it wouldn\'t make sense to use .NET 4.0 or higher, since Mono does not support them either

Answer 1

According to this site it has to do with the support of other computers. Most computers will be able to run .NET 2.0 but not 3.5. It also runs C# 4, I believe, 5, but definitely not C# 6. For some reason, they're kind of behind on things. I think its because there's little benefit of doing upgrading everything.