I also come from an OOP background where I regularly use the Resource Action pattern to write Solid and Clean Code but the MVC pattern used for example in Phoenix completely violates it.
The best software architecture I found until now is present in the book Programming Elixir 1.6 and the Elixir for Programmers video course and both have as author @pragdave .
I strongly recommend you to take a look to both and see how the approach results in a more clean and decoupled architecture 
