You say that "it would take days or a couple weeks to learn XYZ framework/library/whatever to the level of competence that is required for the position", but in

You say that "it would take days or a couple weeks to learn XYZ framework/library/whatever to the level of competence that is required for the position", but in my experience finding people capable of self-learning XYZ framework/library/whatever are exceedingly rare and almost impossible to interview for. Conversely, teaching is really, really hard especially when you have other work to do. There are just so many gaps in a newbie's knowledge that, unless you're prepared for it, add significant friction to support and development operations. I would dearly love to hire someone at whom I can throw work and have them mostly be able to figure it out on their own. Instead, I've had to hire people who don't even know the fundamentals of my various technology stacks. This means I spend a _lot_ of time teaching new hires how to (e.g.) use the Unix command line before I can even think about teaching them how to follow our good current web server deployment practices, use our version controlled configuration management infrastructure, and troubleshoot problems in the front or back ends. Meanwhile, my management expects me to complex offload work items (including service package design!) onto junior staff while not taking into account the effort required to train them. Here on the other side of the hiring line, it's frustrating to say the least.