I think this is the reason.

For a deeper look at this philosophy of craft you won't do much better than The Beauty of Everyday Things, by Soetsu Yanagi: https://uk.bookshop.org/p/books/the-beauty-of-everyday-thing...

You guys learn one term...

This seems the most likely explanation to me.

It's just much more visually interesting than a page full of perfect burgers. Each one looks like a unique thing from the real world; they don't "look AI", as the kids say these days.

"I like how mine's a bit off-center"

Japoneses aesthetics favor assimetry. There's a lovely book , Book of Tea, that have fun with west tastes https://www.gutenberg.org/files/769/769-h/769-h.htm

Burger chizutsugi needs to be a thing.

Like go pieces being deliberately too large for the board they are used on.