Arguably those manifestations of the Romantic movement whose legacy is of concern to Bhikkhu Thanissaro could be seen as inimicable to the Euopean enlightenment movement too....in fact they were in no small part a reaction to the 18th century age of Enlightenment...which of course uses that term in a way very different from Buddhist Enlightenment.
Wordsworth talking of a man who he saw as typifiying the mind set of the Industrial Age says
" An iris by the rivers brim a yellow iris was to him
and it was nothing more "
The author of Zen in English Literature ..RH Blythe talking about that passage shows his sympathy with the Classical rather than the Romantic, with the Industrialist rather then the Romantic Wordsworth when he says
" and from a Buddhist view point...quite right too..."
Things are what they are...they are not symbols.