Hot take: she's the anti-Heinlein. Rhetorically, there are more similarities than differences. Both use fiction primarily for parables - to dramatise their own particular moral slant - rather than open-ended exploration.

Neither is unique in that, but it seems like both were at opposite poles for their time. IMO the moral slant in both is rather heavy-handed and - ironically - there's a sort of bedrock of puritanism motivating both of them, although with different apparent aims, and expressed in very different ways.