Inclusive classrooms raise scores of the lower performing students. That's probably true.
It glosses over what it does to people on the other end of the spectrum.
As someone from the other end of the spectrum, growing up never having to put any effort, having few or no peers close to my level, and being constantly encouraged by the people around me to do poorly for curves etc... I can say I developed life long development/psychological problems as a result, and the idea that I or anyone in the future like me should be slowed down so everyone is more equal is deeply offensive.