Just how legit is using a controller to play MS?

I use a controller, and although I know about those things that you can do with it on MS, I don't do them. It's not the controller that's illegit, but the way that you use it. I can't think of any possible argument in favor of using a controller for any sort of auto-clicking feature, but I don't see anything wrong with using one to play the game.

This.

I've been using a controller to play MS for over two years now, since I find it infinitely more comfortable for my fingers. Growing up playing console games, I find it much more natural (plus, the arrow keys on my keyboard are in a very awkward place.) I don't bot or steal people's FM spots, I play the game the way it was intended to be played... except that I play with a controller instead of a keyboard.

If I recall correctly, isn't there another version of MS that comes built in with the option to play using a controller? If that's the case I don't see what the problem is with using a controller as long as you're not doing something like botting.