Comment by jedberg

> when 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.

Here is their thought process:

If you believe that is the case, then why not spend a couple weeks learning XYZ, so that the next time you need XYZ you can say you know it?

Either it's not actually that simple, which means that it would take a long time for you to ramp up, or it is that simple, and you lack initiative.