Collected on Linkedin:

Please find below some valid points from a discussion about superiority of using C# in Revit (building Add-ins, using Dynamo):

Some points from me:

1. It is not harder than Python – C# is a very modern high-level language. Even C# 7, currently used in Revit’s .NET Framework, is clear and easy to learn. After coming from Python, you might encounter some annoying things like slicing the lists, but who cares. Personally, I prefer LINQ to Python’s list comprehension (BTW I haven’t seen it used much in Python code for Revit API).
2. It is not hard to set up the environment for it – It takes 25 minutes to do it. After that you are good to go and will not have to do it again for a long time. For simple things you can start with Revit Macros and it will take you even less time.
3. C# is statically typed language. It is forcing you (not very strongly, you can use var) to know what exactly you are doing. I found it extremely helpful while learning Revit API (and programming in general).
4. It is used by the best programmers in the AEC industry. Sorry but a lot of Python code available online is over commented, overcomplicated rubbish. It works, but if you need a comment every second line there is something wrong with it.
5. Use of your own classes, as others already mentioned. To it, I will add extension methods - they are so good!

A very valid point from Fernando Borges:

6 - almost every (good) software running on Windows platform exposes it’s functionality as a .NET API. It’s just simple as referencing a .dll inside your project to make it accessible from inside you Revit Plug-in.

Please contact me if you would like to add some other points!