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.

Exactly. People that do tasks more intensive than watch youtube videos and work on spreadsheets don't need any more battery life so thinness is a priority for regular laptops. People doing intense work use t h i c c laptops