If you look at great C# (e.g. aspnetcore source), you'll see that it's heavily OOP - that is definitely the idiomatic approach. I think the main problem with

If you look at great C# (e.g. aspnetcore source), you'll see that it's heavily OOP - that is definitely the idiomatic approach. I think the main problem with functional .net it that all function types are nominal. Functional C# can get really verbose because of that.