Heres a question, if
Different tools for different projects. C# is not normally used for speed critical stuff, because it's interpreted. IE was written before C# was a thing: rewriting it is not cost effective (at least not yet). Stop being a hater. Seriously, it's just a language. Just a set of libraries. Works the same way as most other C-type languages.
It's a naive, domestic operating system without any breeding, but I think you'll be amused by its presumption.