The path of least resistance is a lazy way of looking at things. When I look at make a website, I don't look at how fast I can pump it out, I look at how good of a job can be done with it. And I believe that is where languages like C#, Java, Ruby on Rails excel. Test Driven Development works well in these languages.
In what world of business is taking the path of least resistance being lazy? Making informed decisions that will help minimize the foreceable issues in a project is quite "good" business sense. Selecting tools and services that are well tested and well maintained by the very same community that you are targeting falls into that category. I didn't mention RoR simply because I don't have any experience with it good or bad. I'm sure there are others that can make a valid case for its usage with Bitcoins.
There is no language of Bitcoin. Blockchain.info is the most well done bitcoin related website. And it is programmed in Ruby on Rails. Using your logic, I guess Piuk didn't make a good choice of language for blockchain.info
Not to say that he couldn't, but WHY would Piuk would write his own bitcoin deamon in RoR, when the C++ and Java versions are so fully developed. Does that even make sense to you? Are you suggesting that the OP take a similar route with .NET?