> The 'controllers/directives/services' grouping is straight up moronic

I tend to agree, and this is how I'd organize a larger Angular app, but to be honest I don't think it makes a huge impact in the long run. Rails apps are divided into dirs for models/controllers/views/etc and while I would rather have them organized by feature, they're still easy enough to navigate with modern code editing tools. It's certainly not one of the main contributing factors to how horrible big Rails apps get...