Very interesting point. I notice the website doesn't give any particular answers saying that the Equal transit method is appealing because it is mostly correct. As an graduate of aerospace engineering I can see where they are coming from but as an instructor I ask the question: which explanation does the CAA expect the student to use? Obviously many thiings are simplified, such as the four forces (no mention of resultant force!), but we have to think of this practically.
Everything is much more complicated that the simple explanations and science fact is derived from a method of deduction and constants based on repetition through experimentation. All liquids flow downhill? not quite.. glass and lead are solids etc..
Good point well made tho!
Oveur