A lot of us are on the treadmill of consuming expiring information. Not Buffett. He filled his mental filing cabinet with information that had a long half-life.
I remember being in grad school, encountering fellow students who would say, "I want to learn X-Windows, so I can get a job doing that." Not such a huge market for that now. This is why you want to have a working knowledge about the whole stack. You won't necessarily build a compiler or write a low level library in your job, but if you actually needed something like that, you'd know enough to shop around for the right one or hire someone to build it for you.
I all you're learning is how to jockey around one opinionated framework, or just barely learning how to glue libraries together, you're not learning information with a long shelf life.
I remember being in grad school, encountering fellow students who would say, "I want to learn X-Windows, so I can get a job doing that." Not such a huge market for that now. This is why you want to have a working knowledge about the whole stack. You won't necessarily build a compiler or write a low level library in your job, but if you actually needed something like that, you'd know enough to shop around for the right one or hire someone to build it for you.
I all you're learning is how to jockey around one opinionated framework, or just barely learning how to glue libraries together, you're not learning information with a long shelf life.