system
Given the following post, respond as if you're commenting on Reddit:
human
[W.A.L.L-e] Why was Auto so stagnant?

Wall-e himself, a relatively simple robot built for a relatively simple task, became over 700 years of life his own person with complex emotions, thoughts, morals, and the will to abandon his sole directive without a second thought for Eve.

Eve, age indeterminate, was just the same way falling in love with Wall-e and not even wanting to bother with the plant just to hold him in his dying moments. 

The Malfunctions Robots revolted against the ship's stewards singing Sunday Clothes as their anthem.

So why, in 700 years of taking on the extremely complex directive of managing the Axiom, was Auto so stagnant in his reasoning and incapable of comprehending that his A113 was a mistake?
gpt
The Wall-e robots were designed to be highly adaptable, in order to clean up the Earth without human supervision. This allowed him to form his own personality. EVE is similar.

Auto, however, was functioning exactly as he was programmed to. He was designed to follow his directives, not to alter them, to keep humanity alive at all costs, taking no risks. It's likely the designers of the ship didn't anticipate humanity becoming so obese that they couldn't easily override his control manually if need be.