Having said that, I am possibly a bit like your boss. I am a major bottleneck to my employees, and they struggle to overcome technical skill gaps between their knowledge and what they need to work on. Frequently I find they are blocked for days or weeks and when I finally get to sit down or spend time with them, their problem is sometimes solved within minutes. Sometimes I resent it because it's clear to me with some basic effort in learning new skills, they could get over these humps but they seem to take an attitude that if they hit something they don't already know, it's perfectly reasonable to stop progressing it and just declare they need help. It's really alien to me because as a young developer I would never have done that, I would just keep acquiring knowledge until I solve it (possibly taking a lot of time). While I'd never outright deny a direct request for help, I will often redirect where I think they can figure out the problem themselves with some investment in their own learning - "you need to learn about X, do some reading and tutorials, I think that will help", etc.
I am curious if you would have advice? Assume you can't solve the problem of actually getting your bosses' help (they simply have too many responsibilities to be helping at a micro level), how could one develop a culture of self-learning and proactive responsibility to progress things?