That seems like a weird way to think about this. I mean, sure, there's no time today to learn make to complete your C++ ticket or whatever. But yesterday? Last month? Last job?
Basically, I think this matches the upthread contention perfectly. If you're a working C++ programmer who's failed to learn the Normal Stable of Related Tools (make, bash, python, yada yada) across a ~decade of education and experience, you probably never will. You're in that 50% of developers who can't start stuff from scratch. It's not a problem of time, but of curiosity.