Learn the Technology, not the Framework
I've discussed with several people, this year. Technical leads, technical supervisors, architects… You get the gist. Among those discussions, I heard a recurring complaint, which I previously feared to be my demanding nature expressing itself.
But no! Other people noticed it too, and it basically boils down to something like this: we're facing a new generation of developers, who like to do things fast and don't care much about how things work deep down, and we're living in an era proposing a new framework to help them go faster and not understand. The two together won't make for great developers. Good developers, maybe, but not great ones.