Just realising two things:

1. Any text in a poetry block cannot be easily restacked - you have copy the text, then restack the post then paste the text as a quote.

2. Sometimes text between two paragraphs cannot be restacked (on a phone only?) - often in poetry the quote you want to share spans two stanzas and this prevents you from capturing that.

I really like the poetry block because it helps with the particular formatting of the poem but i realise it is also less condusive to sharing and thus could impact on how well your work gets out to new readers.