I agree with all of this, although I think that being "gratingness" absolutely has its place in music. Some people use grating music as a kind of shock therapy - like ice baths, running marathons and bungee jumping.I view a China as something like a dissonant chord; it makes a nice contrast and a good way to break up the flow when used sparingly, but when overused they just become grating and pointless.
Also, Chinas can make a lovely, exotic sound played gently. Great for spacey passages. I had an old, bent green sizzle cymbal that I converted to a pretend-China. I used it sparingly but I loved playing it in those moments! Wish I didn't get rid of it now