Mobility can be a plus. Cost followed by heat can be big negatives.
I have a high end Alienware m15, but typically daily a 15.6" i5 XPS. Z
Do laptops cause more heat than desktops or are you talking about putting more strain on the hardware ? Sorry not trying to be confusing.
Does it matter to have a dedicated graphics card if you don't game on a laptop ?
Is there any advantages ?