I agree entirely. Or even an on-line planning tool. Pre-flight planning doesn't have to be difficult to be completed correctly - and advantage should be taken of modern technology as a safety enhancement.
Another thing I really disagree about is the CAA expecting people to try to remember all the factors to apply for t/o and ldg performance on grass etc in the PPL exams. When I used to instruct on 4-jets, I told folk never to try to remember the various degrades to be applied for 'contaminated runways' - ALWAYS use the book. The CAA produces Safety Sense 7 which lists all such safety factors - but students aren't permitted to use it in their exam. Madness - and a very bad habit to develop.
Any pre-flight planning tool should be simple and easy to use. Because then people will actually use it.