"I cannot work out why you think that looking at "cool stuff" is in anyway a preparation for a career in aerospace or mechanical engineering?"
Looking at cool stuff is how to get kids interested in the first place. A good example is chemistry - nice energetic reactions (loud bangs, smelly noises especially) get attention and have the cool factor. If you hammer kids with the mundane, they glaze over and lose interest, watch x-factor and decide they want to be a pop star instead.
One of the key reasons we struggle to get kids into careers in any form of engineering is because of the misinformed view of it being dull. Without emphasis to some degree on the "cool stuff", you won't get them interested in the first place and they won't be bothered to gain even a layman's knowledge, let alone go anywhere near a career.