[s1artibartfast]

I think you absolutely can divorce greatness from goodness. Think of Genghis Kahn, Stalin, Alexander the Great, and even Hitler.

These are humans who have had an outsized impact on the course of humanity.

Perhaps similar historical events would have come about with a different person, but they were the human that made massively impactful decisions. Their personal whims and experience decided the fate of large portions of the world.

They had a great impact. If that is not the same as greatness, perhaps we need an alternative term to describe great impact without moral connotation.