I see your point but the world changes so fast. Back in my day you just needed to learn C, understand algorithms and so on and then you could get deeper in an area or two. Today, you need to understand and be able to proficiently use so many technologies that you can feel lost.

And this is what happens when, say, you loose a job you've been doing for 10-15 years. You need to re-learn the world. And a lifetime is not enough to do it the way we used to do it.