It's somewhat similar to what happens in design. Trends come and go and anyone who is seeking a new design at any given time will want what's mainstream at that

It's somewhat similar to what happens in design. Trends come and go and anyone who is seeking a new design at any given time will want what's mainstream at that time. It's not exactly the same that's happening with Rails and JS, as here the difference also concerns the quality of the end product, but it follows the same logic.