If the Corries tune for the song is close to the original, it makes me remember that most folks prefer "Wild Mountain Thyme", largely from the McPeakes, to the original "Braes of Balquhidder", and that the American Civil War song "Faded Coat of Blue" was originally published with a fairly dull tune; the current, popular tune having been collected in Texas later.
I, myself, prefer the 'arrangement' of the American song "Darlin' Corey" done by Burl Ives to the fast version so popular with Bluegrass bands...etc...etc. I also prefer a slower paced treatment of "Yellow on the Broom" than I have heard done in recorded versions.

Sometimes a song just 'feels' to someone like it needs a different interpretation. My son sings "Grey Funnel Line" even slower than *I* care for, and a lot slower than most do it.

   I can live with most variations, but I still cringe at some folks who seem to totally lose the essence of a song to suit some personal whim or to achieve 'difference for the sake of difference'.

   ...and *smile*...you do too- just maybe not the same ones.