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Either they are the best and everyone uses macOS"Best" obviously means different things to different people, but at least by market share, macOS has never been the best. Modern Apple doesn't seem to care about market share outside of the iPhone (and even then, they are still more interested in the iPhone being a premium product than winning on market share).
I used to like macOS, 15-20 years ago, but now it's just power-user-hostile and considerably more locked down and buggy. That's not the way to be "best", by any metric I can think of.