> Strangely, I see so many new developers rushing toward the front-end

"Easiest" area of programming to get a decent job and enter the industry. It's so much easier to find a job in big cities if you know Angular or React. As long as you keep yourself up to date in frameworks and tools you can theoretically stay employed for a long time.

That said, I have heard of plenty of people who had done the above getting burn out or bored after about a decade.