When I graduated, long before PC CAD, I was given a drawing office, so even though I knew how to draw, I had a team of draftsmen to do that for me. Then I had my own business before PC CAD came along and I designed on a drawing board. When PC CAD became available I had little need for drawings so there was no need to learn it. Now it would be useful to be able to use CAD occasionally, but nowhere near enough to warrant the time needed to learn it. Even daily CAD jockeys find some operations difficult to do, let alone an occasional geriatric user.
A few years ago I was working with a famous race car designer on a project. He said that when he started out in the business, the conversation over the lunch table was about suspension geometry, roll centres and other performance related stuff. When CAD came along he said that the conversations had changed to "how do I draw this". For this project he ordered a huge drawing board so that he could layout full size prints of the car. he was a skilled CAD jockey himself but nothing replaced the full size version that you could pencil draw on.