Once again, I have compared Sly Cooper to Battlefield 3. It's honest to god why I went out of my way to play both games; so that I could compare them to my current vast palate of game experience and integrate any positive or negative game design into my personal artistic philosophies. It was also neat that the Cooper series was amazingly fun but I bought it because it might make me a better artist with a more informed opinion. By comparing Sly Cooper and B3, one a narrative game and the other generally seen for its multiplayer, we get a small part of the bigger picture as to what makes these different sub-mediums work. I have been in the last year compiling several rules of sub-medium and I couldn't do that without comparing my experiences with games exactly like you said.
Of course there's a bigger picture to comparing PM and Wall-E, yet you don't want me to compare them so I don't know how you are ever going to see it. Here's an OP ed piece I found that compares Wall-E and PM in an attempt to discover why these movies succeeded where other environmental movies fail. I haven't read it thoroughly and can't attest to its opinions, but it's a legitimate question. By comparing and contrasting Wall-E and to PM to Fern Gully, asking why the first were good while the later was poor, we can form artistic philosophies that will better prepare us to make our own environmental movie in the future, or help us get a better sense of why we enjoy certain movies and dislike others.
So why would someone writing an academic paper on the matter (which can't be stressed enough) benefit from comparing Disney and Ghibli? Maybe he's an art or film student, and he's busy (with the teacher's instruction) forming his own artistic philosophies. If he wants to be an animator, is he going to take cues from Disney's thick bubbly colorful direction, or Ghibli's sharper detailed yet still whimsical direction, or is he gonna try to forge his own path using all the experience he's gained by examining both? Hell, noting those thick lines is more useful than anything you did in the thread, not to mention that its another comparison that you say is so futile.
To illustrate why comparison is so integral, it seems to irk you that people in the thread called Ghibli objectively better without explaining why. Without proper comparison they might not be able to fully articulate it, but I can. The #1 rule of animation as a medium is that things should be in motion more often than that. Animation is after all, "The act, process, or result of imparting life, interest, spirit, motion, or activity". You'll find few animators who disagree with this point. As a big budget movie studio Disney certainly always did this above average, especially in terms of musical numbers. But what truly separates Disney and Ghibli (who can also do thick bubbly lines) is in the more mundane moments. Ghibli animates faces better. Ghibli is the only studio where I can get a sense of a character's hair standing up in the back of their neck, it's such a minute and subtle motion when they do it but it's so powerful that it makes my own hair stand up every time. The layers in establishing shots don't pop out as much. The action is smoother, more intricate, and often has more layers on screen. That's an opinion, but it's one that comes from careful examination of over a dozen movies. My current game has no animation, but hopefully the day will come when I can instruct employees to follow these principles.
In short, comparison of vastly different art forms helps us get the most out of each. It helps to establish rules of medium, it helps us develop artistic philosophies. You subconsciously compare these things which causes you to develop opinions, but only by doing it consciously will your opinions be more informed and more articulate. You should always be the first and second person to question your own opinions, and that's not an opinion; that's advice. Why don't you man-up and try it the next time you see a movie, instead of complaining that I keep missing your point; your point keeps changing. If it truly ever had to do with how you don't want people to say one is better than the other, which I keep calling you out on, you sure as shit didn't say that in the first place when going off on a tangent about how two unrelated subgenre movies couldn't be compared.
I've tried to "understand you" because you are coming across as incredibly foolish, but no one I've asked about it on IRC knows what you mean when you say you can't compare Ocean's Eleven and Reservoir Dogs, or Disney and Ghibli for that matter, as apparently no one in the thread has given that they keep trying. Also again, for a thread to help an academic paper to compare the two, I'd wager the teacher doesn't understand you either. The smartest thing you did was take this to PM, cause the OP explicitly wants what you would deny him (and for absolutely no reason, you've shown that you could have added new insight to the paper instead of trying to stop the thread).