First statement I absolutely agree with. As for the second, well I'd tell you that is what you're paid for.
People are conversant in any method of presentation, so long as care is taken to communicate the information at a level the listener can comprehend.
I agree 110 percent, if that is possible. Then again, you probably know this with my repeated presentations of multiple intelligences and other similar posts that speak directly to this fact. We certainly do all learn differently.
However, when learning why something works, scientifically, any understanding that does not include math is an incomplete one. The numbers are the core of science and I think we can both agree that flight is a science.
I don't think there is a person reading these forums who is incapable of attaining a basic algebra education. In fact, I'm fairly certain it would be a refresher from the high school years for most.
It is the instructors job to make sure the forest doesn't get lost to the tries, as you put it. Something I quickly learned about science after graduating college and joining these forums was that the rabbit hole almost always goes deeper. However, learning differential equations isn't by any means a prerequisite for gaining a rudimentary understanding of the dynamics involved in flight.
I don't think anyone has presented anything looking remotely close to what you see below:
Now if this is the kind of thing you're expecting out of the average person. Well then I'm certain the forest won't even been seen, much less losing it to some trees.
Again, it is the teachers job to ensure this doesn't happen.