"The doctor at 40 doesn't seem to be worried about discovering that all his knowledge of the vascular system is about to evaporate in favor of some new organizi

"The doctor at 40 doesn't seem to be worried about discovering that all his knowledge of the vascular system is about to evaporate in favor of some new organizing theory. The same goes for the lawyer, the plumber, the accountant, or the english teacher." This is the point you think in a wrong direction. All of this Jobs need a basic knowledge (a developer need it too) and all auf this Jobs need tools or regulations to do the job. A doctor need knowledge about new medics, new instruments. A good teacher teaches not the same way for 40 years. ... React or whatever are tools. And yes, the most tools reinvent the wheel and this is not development specific, this is valid for many jobs.