[abecedarius]

But this doesn't argue for the low-to-high order, because of reversed(). This code would be simpler and faster with the coefficients in the opposite order.

[rzzzt]

You're right, the process does start from the higher coefficients, and so does not really support the ordering presented.

You either need to use foldr to defer the multiply-and-add until the end of the list is processed, or reverse the list before processing it.