We do not feel obliged to sing all of Matty Groves so I don't think we should feel obliged to sing all of Kipling or Fox." that is in my opinion comparing oranges to cauliflowers, kiplings work is his work,authors of poetry intended it to be performed as they wrote it, or to be able to agree with alterations,it is their artistic work.
MATTY GROVES is a traditional song that has undergone the hands of the people, in other words[excuse pun] it has been folk processed.