Having recently changed jobs to become a Consultant after working 15 years in the Retail Industry I think about this chart a lot.
I’m personally at a stage where I think I know quite a bit but I’m mostly overwhelmed by how much more there is to know 🤯
I also need to become more comfortable with the fact keeping up with new technologies is almost hopeless, but is also not required.
With age and experience you realise the actual technology matters less than you think, what really matters are general techniques to solve problems, ways of isolating issues, seeing the big picture in your head and so on.
In other words you build mental models of how things work and apply that to problem solving. Things that only come with age and experience.