@Chumly,
Nice article but you seem to imply the "water analogy" is not widely taught.
That model certainly helped me in England back in the 70's.
In fact when I briefly taught the (ancient) triode in high school I actually modelled it using a rubber water pipe from a fixed height reservoir with the end of the pipe attached to the longer end of a meter ruler pivoted off centre. By moving the short end of the lever (ruler) a short amount (small grid voltage) you obtain a large movement (amplification) of the other end ( main voltage) causing proportional current variation seen emerging from the water pipe.