Again I’m not interested in how quickly you can create an app.

I’m interested in your ability to maintain very complex business logic over the course of years.

Working at a Ruby shop now, I can say with confidence I will never touch it again with however long of a pole I can find.

I think this is a bit over the top. You can maintain complex business logic in any language (any language!) for decades with discipline and good software development processes.

Ruby lets you do a lot that could bite you, but it's people who write code.