The divide between these roles you mentioned has gotten bigger over time in my opinion. It's maybe easier nowadays to put together an okay-looking proof-of-concept app, but when getting into large apps and high traffic, the stack has gotten more complicated to do right. You don't just roll out server-rendered MVC app, but need front-end with 3 layouts for different devices and state management more complex than on the back-end. Or maybe that's just my feeling.