Had to learn how to use the 'Flight computer' and i must say what a great piece of kit why would you want to go digi?
Because digi is alot faster and more accurate for flight planning. And because a few rule of thumbs are a lot safer than diddling around with a circular slide rule in flight when you should be watching traffic.
I found the E6-B amazing when I first learned to work with it. But then I realised that software does the trick much more efficiently. The AOPA flight planner, integrating forecast winds aloft into a log, is simply amazing. A pity that we don't have this is Europe (at least not for a € 40 membership fee).
To students, I would recommend writing some software that does what the E6-B does, to make sure that you've grasped at least the methodology behind it and to learn some orders of magnitude of typical wind corrections. I did that after completely messing up my first holds (during a hefty crosswind) for my IR.
But it is ridiculous to insist on the use of a 1940's instrument when alternatives are commonly available and which in practice nobody uses anymore. (This is contrast to the VOR, which is also a 1940's instrument but which people in practice still use
)
I have given up putting in a wind calculation into the plog as winds are never what they are forecast to be (I did on a recent trip via Skydemon and the resulting heading was way out!).
That is a recommendation that I cannot subscribe to. For long cross-country flights, a turning or increasing wind can mean the difference between making it with reserve and not making it at all. You want to anticipate this by simulating a variety of realistic wind strenghts and directions to see what gives.
I fully subscribe to the other points you are raising.