Many aliens speak of their uniformity within their race. The Greys seem to be more uniform than others. We understand that there are different types of Greys, but the Greys seem to have a stronger connection to their common mind than other aliens we know. Of course, our knowledge of aliens is very limited, but glimpses we have highlight many differences.
The uniformity of the aliens within their races scares us. We do want to evolve and become better in many ways, but we would not be happy becoming standardized.
A large part of the fear of standardization comes from again our experience with negative leadership, which is hijacking of leadership by MIC. I understand that this is typically an Orion trait, but it served humanity largely in a negative sense. Our history is dominated by wars, growth and competition of empires. Very often empires brought standardization to the small diverse nations that they conquered. This was not considered good by these small nations. A worst case of standardization was demonstrated by German Nazi and Soviet empires some 60 years ago. These were empires focused on war and they killed huge portions of their own population and of the population of conquered countries. In addition, typically the most talented, best people were killed, since they were unique, stood out, were better thinkers and were protective of their own people. Traitors and people without morale survived.
German standardization included industrial-scale killing of millions of people on the basis of their ethnicity. Soviet standardization included killing people on the base of their professional origin. Also best people with best intellectual properties and morale were killed, devastating the gene pool of the empire and lowering the morale of the people.
Therefore based on our history we strongly disapprove of standardization, especially by outsiders (since again, in our experience, outsiders are known to us to take advantage of conquered nations).
MIC = military-industrial complex