Because I was originally planning on just having the plate of cheese until I discovered there were a couple of leftover tortillas which would make the “meal” marginally less miserable.

Though I think that melting it on the tortilla wouldn’t have worked as well: the melted cheese had a wee layer of oil which I poured off onto a paper towel; also, to melt the cheese, I had to do it in a few short blasts, rearranging/“stirring” the cheese each time. I think that had I done this on the tortilla, it would have become a soggy mess.

Your question is a good one though, and I hadn’t considered it until I read your comment.