This may sound glib, and I apologise in advance, but really, who cares??
I know the standard of my students, and I know that when grades are awarded to my students, those grades will mean something.
I know that I have produced blue/purple/ and brown belt students who are more skillfull, have more knowledge, and are better fighters than a lot of other dojo/dojang/kwoon black belt/sashes based on the training methods I employ.
I'm concerned with focusing on my students. If other schools or systems want to give belts and grades like Smarties, then C'est la vie. It's no skin off my nose.
It's like I'm always saying, Cavaet Emptor.