- They never committed to the practice in the first place
- They don't have time to dedicate to learning
- They're married, have kids, when they leave the office — they're done with it already!
- They don't know how to plug into educational sources, not coming from a degree program
- When they started, there weren't as many books or research to learn from
- Textbooks are expensive
My suggestion is that you can find time to read. Ideally for me, it is on one of my electronic devices. My "major reading time" is when I grab 5-10 minutes on my M-F commute to work. Currently I'm "still" reading American Dunkirk about the evacuation of Manhattan on 9/11. I'm also reading three other books concurrently — and slowly!
My experience — even recently, is how the book is making me think about disaster response and the need to leverage our nontraditional first responding citizens to be part of our larger disaster response and recovery efforts.
Take time to grab your own few minutes to keep your creative and insightful juices flowing. Don't grow old and stale, limiting your advances in thinking to only experiential events in your professional life. We can learn from others, and reading is a great way to start.