I agree with this point, but with laptop battery life, unfortunately the alternatives are all significantly worse than simply having a slightly thicker/heavier

I agree with this point, but with laptop battery life, unfortunately the alternatives are all significantly worse than simply having a slightly thicker/heavier laptop. They almost always involve carrying additional devices (needing their own protective enclosures, cables, etc) and require additional cognitive load (Which spare battery is charged? Where did I leave that battery?). A bigger internal battery eliminates all of that. There are very few options (if any) in between.