> You think that 10 and 20 year olds growing up with computers and even smartphones available for all of their life, know less of computers than people in the past?

Yes. Aptitude with screwing around with a GUI isn't very relevant.

40 years ago, computers were at best used by clerk type people for specific tasks at a terminal. Accountants were using tabulation machines, written materials were on IBM selectrics.

The people engaged in professional work with computers were mostly programmers or others doing "data processes" or working with business analyst types to model business process around workloads that could live with the available computing resources.