Navigation flight planning during training

Recently, Andrew Sarangan posted:

As I mentioned in a related post, I once had a student who painstaking
did all the calculations by hand, but everything was reversed by 180-
degrees. It was because he was so caught up with measuring the chart
and operating the E6B that he missed the big picture.

Isn't "the big picture" in this case learning how to navigate? Is not
checking your results and becoming aware that something is wrong is a part
of that process?

One could argue
that had he done it by computer, his brain might have been more
relaxted to catch that sort of mistakes.

Or, more likely, the computer would have provided a solution that the
student would have accepted as unquestionably as the result that was 180º
off. That the computer may have given a correct answer is not really
evidence that the student has learned anything. Watch a cashier insist
that the change for your purchase *should* be more than the cost of the
item, and you'll know what I mean. ;-)

regards,

Neil