... make 'em earn their money ... that's what they're paid to do.
It's an amazing thing .. most of us have the same sort of experience ... spend 40 - 50 years in whatever disciplines we profess ... become quite expert in one or two things (an expert = one who has had enough time to make many more mistakes in the field than the average chap and, hopefully, learn along the way ...).
Then, eventually, we retire (retirement = when all the other folk have come to the realisation that one is past one's use-by date) and do sensible things like sailing, fishing, etc.