As mentioned above, most so called checklists used by Flying schools are amplified operating procedures. By far the safest way to operate most aircraft is to accomplish normal procedures from memory, then use a checklist to “check” you have completed the procedure. Flows and / or mnemonics can be used to help with completing the procedure and the checklist should only be use when you think a procedure has been completed. The checklist should only contain items likely to embarrass or kill you! Including stuff like fastening harnesses, setting radio frequencies or detailed engine run-ups have no place in a checklist.
Its painful flying with pilots of simple aeroplanes who cannot operate without a do list.