When I was a lot younger I built a very big and complex platform with Phoenix. Although it was a technical marvel, it's one of my big regrets as far as the tech stack I went with, because it's now useless for my actual work now a decade later.
Do you mean because you can’t use Elixir/Phoenix for work? Because I don’t quite understand, doing a big project and learning/using a particular tech stack should have many transferable skills.
In retrospect, I wish I had built it with C#/.NET