I'ma little late to this Epcot symmetry thing, but wasn't it suppose to be the right and left side of the brain, from above it looked like the brain?
Well, then, the left hemisphere would be missing a lobe with the 3 v. 4 pavilion asymmetry.
The left v. right brain thing is a myth. While certain parts of the brain do have dedicated tasks, there's no science to show that an entire hemisphere is dedicated to creativity and the other is analytic and that one being dominant over the other determines your personality.
I read once someone debunking that left v. right theory about Epcot buying into that brain myth. But, that person could be wrong and indeed the imagineers of the time believed in the left/right dichotomy.
The funny thing is that, on the Internet, you'll see that everyone point out the layout of the paths is 'proof' of that intentional left v. right design.
One would think the pavilions should have also fallen into that dichotomy, but they don't. It's clear that The Land and The Seas isn't about someone being "creative." It's about exploring the natural world, which requires analytic observation and discovery. Only Imagination would work under the left/right scheme.
The better explanation for the meandering paths in the West is that they were made to more organic, like Nature, as a nod to Seas and Land. Not because someone was super artsy and couldn't walk a straight line because of how creative they were.