I know a lot of people with physical disabilities. I've been one myself; I'm married to one.
Nobody's asking Apple to make all of their laptops heavier. And I don't think anybody's asking for 9lb / 4kg monstrosities from Apple, either.
What I see is a lot of people wishing for pro laptops from Apple that eschew their "lightness at all costs" philosophy in favor of a more balanced approach that offers some extra functionality in exchange for, say, an extra pound of weight or something.
That wouldn't preclude Apple from selling smaller, easier-to-carry models.
That's a reasonable ask, yes?
I would and did for a long time, and I am very glad for the lightening trend. Try considering for just a moment that there are many people in the world who aren't as ablebodied as you. Small changes can make big differences.