I wonder if sometimes always telling people to not do anything themselves and use already made libraries is robbing the industry (and especially juniors) of lot

I wonder if sometimes always telling people to not do anything themselves and use already made libraries is robbing the industry (and especially juniors) of lots of opportunities to learn. In an ideal world, that is what university should be for. I rolled a whole bunch of my own numerical code while working on my degree, and got to learn in a 'safe' environment how hard it actually can be and all the pitfalls there are. When people say don't roll your own crypto, what they really mean is don't roll your own crypto and use it in production. Completely off topic. If I was forced to choose between a slow cooker and a stand mixer, I would keep my stand mixer every time.