The Cliff Notes version (as I see it):
Those advocating for inclusivity want WotC to more explicitly offer rules/guidelines that represent greater diversity (e.g. good and smart orcs), and do away with any stereotypes that can be connected to real world ethnic groups.
Those advocating for heritage are wary of (what they perceive as) unwarranted changes that overly mess with D&D tradition, and dispute said linkages to racial stereotypes to varying degrees.
So the purpose of this thread is not to endlessly rehash those elements, but to recognize that both are valid perspectives and discuss how the two can be integrated.