Dear God, go see Wall-E now. Pixar was right. Don't read this, go see WallE

[Grey Acumen]

I can SORTA see why people have issues with the fat people, I mean, when you think about the idea that 700 years down the road we'll just be a bunch of fat people in chairs, it's only about half a step away from being the matrix all over again, and it's something that you naturally resist.
But it was a really important part of the movie as even despite this way of life, it wasn't that people were trying to be lazy, it's just that's all they knew. Once you gave them a wake up call, they realized they could actually do things more than just their standard routine. not only that, but when they realized that they could do more, they WANTED to do more. I actually felt that it was very inspiring to think that after a thousand years down the road, even with absolutely no real physical needs, people still have the desire to accomplish something for themselves.
Wall E was that wakeup call, the inspiration, essentially a physical manifestation of becoming more than you were ever expected or even intended to do, and he did most of this purely unintentionally while pursuing love. It's a very important part of what makes his character so special.