[pxc]

FTA:

> “The thing I really want to do is establish palindrome writing as a literary form, to show people you can write palindromes that are beautiful and funny and factual and have real literary merit,” he says.

To me, even just the examples you gave prove that palindromes are essentially poetry in a totally ordinary way. The idea is to express something, intellectually and/or aesthetically, creatively, under constraints based on the structure of the words. Usually it's the syllabic structure, but in the case of palindromes it's the orthographic structure. And it's a really, really hard, singular constraint.