That's completely ridiculous. That might be the most insane thing I've read in the past month, and with all the insanity in the world right now, that's really saying something. An airplane is just a different class of car. A turd is just a different class of a meal.
Honestly, I'll keep it somewhat civil and leave it as "ridiculous."
The reality is that there are different classes of bikes that different speed up and down hill. Some of them are now e classes. That is how the governments of the world classify them and how local clubs and race organizers classify them. They are simply a different class of bike.
I am about to enter an enduro race series. Do I race e bike class or do I race mtb class. There's two race options for mtb. Pedal up all the hills and shuttle up the hills option.
In that race there's 3 hardness levels.
Hardest is he pedal up mtb class, second hardest is the pedal up ebike class and the easiest class is the shuttle up mtb class. Racing the enduro down is similar hardness on all bikes. The E's take a bit more effort on the down because they are heavier. The freshest riders at the end of the race will definitely be the shuttle up mtb guys.
Out of this scenario do you still scoff the e-biker or does the shuttle up mtb guy get more scorn?
Now back to differential speeds between classes a dh bike pedalling is bt far the slowest up a hill and the differential speed between xc and dh uphill is far far more than xc and E. If you wanted to make and arguement for effort expended to get up a hill an xc bike takes way less effort than an enduro bike should I mock you for cheating for taking an easy to pedal bike up a hill.
The mtb world is filled with more layers of grey than the black and white that you propose.