The trouble with the long winded checklists is that instructors use it as a learning aid rather than a list of things to check they've been done.
Things like hatches and harness secure, should be a check, not a prompt to put on a seat belt.
Things like starting the engine should be able to be done from memory, particularly the first three after start items, RPM 1200, starter warning light out, oil pressure rising to green arc or shut the engine down, and yet countless students let the engine sit at 1600 RPM, take ages faffing turning a page on the list and ignoring these important checks.
If given a list that simply said "power checks - compete" as a pre take off check, I honestly wonder if a lot of PPL holders would be able to complete the checks without a list telling them what to do next.