That's right. Any abrasive technique can scratch not just the screen but the special coatings on it.
But you are not correct in impliying that you can "scratch with microfiber cloths." Precisely because they are microfiber, they are less likely to scratch than almost any other type of cloth out there. Again, if you clean with a microfiber and it scratches, you had a foreign particle in the cloth. But that isn't the fault of the microfiber at all.
Microfiber is a great material because it's designed to be able to remove fingerprints and other stains with no soap or chemicals, just a little water. And it really works. This is why so many electronics companies put a microfiber cloth in with their products, so people will not use harsh chemicals or materials like paper towels or paper tissues. (Paper is wood pulp, and the wood component can scratch. Paper is not recommended for any delicate optics.)