Even when their first language is English, I often have a hard time understanding what poets are saying. :)
"Post-modernism" (actually a political ideology) changed art.
LIBERATE YOURSELVES! Throw off the shackles. No more rules! No more form! Anything goes! No ones right, no ones wrong. Everything and everyone is equally beautiful. Do you want to be an artist ... just say so, and you are!
Today, anything involving "words," that is not a "grammatically and syntactically correct sentence" (i.e. prose), is now being called "poetry."
Most poets are familiar with what Robert Frost had to say about free verse, "Writing free verse is like playing tennis without a net."
I prefer the sarcasm of G.K. Chesterton, “..."vers libre," (free verse) or nine-tenths of it, is not a new metre any more than sleeping in a ditch is a new school of architecture.”
In fairness, I've read some free verse that I find pleasurable, but in general, I much prefer verse.