I wouldn't really know to agree or disagree as I said I haven't rendered myself. The point of my list wasn't necessarily to say all of those are related to using a laptop. They are just factors that I've seen referenced before in discussions on the topic of bush rendering.it doesn't matter on what machine the render is made.
It's just about using dasz the right way (or even blender).
The best machine doesn't make up for lack of skills - and the best skills will do great renders even on worse machines.
It's just how long it takes to render - not about they are clipping or not.
Claiming that clipping issues are caused by using laptop is just bullshit talk