Oktas8 Nothing harsh with what you said.
From a student pilot perspective with less then 50 hours, learning one generic landing checklist that gets my backside on the ground with a working aircraft seems less complicated then learning a manufactures checklist every time a change type even if individually they are all shorter (this is during ppl training only).
commonly when you change type its to start the next phase of training ie navigation. So if you can bring everything you memorised from a C152 and bring it straight across to a new type, you can focus on learning that pesky navigation stuff and everything else should be second nature.
Have you changed aircraft type on a student during PPL for what ever reason and given them a new set of manufactures checklist to digest as well as the lesson material, how did that go? (serious question)