Gemma
Most of those checks are pointless thats why.
Hatches and Harnesses for instance--whats changed since your last check did you open the doors on landing?
I would leave the fuel pump on
U/C --ridiculous (landing wheels up mainly happens to PPLs who forget the checklist that they rely on to prop them up esp after a GA)
Pitch -- ridiculous
I mean why not check the cabin is depressurising too and the cabin crew are secure. (well you never know you might be fliyng an airliner one day, thats your argument)
The main reason is that I am most likely in a circuit with low hour pilots who think lookout is something to do with a bank raid. All of my attention is going to be focussed on lookout.
I think the chances of you landing wheels up in your Warrior are a bit slimmer than having a near miss in the circuit but as you already know I do not think or teach like others do.
I would aslo add that long lists encourage reading without doing(in my 20,000 hour experience)