Haven't read the article, but I know spinners are getting less use in Australia since they started using the new Kookaburra a few years ago. Going in to a match expecting a spinner to win a match isn't that good a plan. If Stokes can't play as a fourth seamer, they'd be really short going in with three seamers and a spinner.
I think they'd love it if Bethell and Root could cover the overs of a spinner.