There's plenty of JS code written out of the real needs and by teams running huge projects, take just Facebook as an example. Problem is that there are thousand

There's plenty of JS code written out of the real needs and by teams running huge projects, take just Facebook as an example. Problem is that there are thousands of solutions for everything, and that saturation and bad signal to noise ratio makes it hard sometimes to pick the right lib (or even hear about it in the first place). Rails have a huge benefit of having a single team behind it, so you always have a recommended way of doing things, and the whole community is smaller, less libs to test, less rubbish to avoid, making the experience much more linear...