It all seems part of the desire for the inaccessible.
That’s an excellent and subtle point.
I think different poet-tribes have different ways of reading, though. A lot of what you might call mainstream poets do seem to go in for a sort of chanting, with rising inflection at the end of each line or stanza. I don’t know if I’d call it toneless or mechanical. But I’ve heard plenty of poets who go for simply a slightly more dramatic version of a normal reading voice, which is what I prefer myself. And obviously there are many who declaim or act out their poems in high dramatic fashion. So I don’t know if any one style of delivery can be said to dominate any more.