What is poetry

[Bruce V]

“No one would use both rhyme and alliteration, except as a joke.  Nonsense.”

Why don’t you try and write a long poem (which is what Piers Plowman is) using both, and see what people have to say?
It’s not particularly difficult. A precocious child could do it.
I have written several epic poems, using both.  You are right that they are not well received, but they weren't a joke.  The "precocious child" comment is, I assume, meant to be an insult, and I will not get involved in that.  

It’s not going to be taken seriously.

“Except when it is:  ie. Idyls of the King are straight narration.”
So the death of Arthur is “straight narration”?
Rubbish
Narration:  the act of telling a story or recounting a sequence of events.  I think the multiple chapters of the Idyls counts as narration.  Perhaps I shouldn't have used the word "straight".
of

“ Later you say "poetry is what craftsmen say poetry is".  Contradictory”
Which is not the same thing as “anything and everything”.

“ Certainly true for some poets, but it is mistaken as a generalization.  Different poets are trying to do other things.”
What “other things”? Either add to your own question or I’ll take this as reddit style engagement farming and move on to better things than clicking on a low value post

Anyway, you posit that "poetry is what craftsmen decide what poetry is".  That alone tells me your view on "What is Poetry?"  I do not seek to argue anyone's view.  As I mentioned I'm just curious to know how others see it.

I don't know what "reddit style engagement farming" is; I don't even know what reddit.  But if I had to guess I would say you think I'm just trying to get a rise out of people.  No thank you.