It's a freaking calculator app......it doesn't have to be "great".....it just has to do math.....my god.
And that's why you aren't an Apple software engineer. "Good enough" isn't their philosophy. In the meantime, no one's stopping you from downloading a run-of-the-mill calculator app or just asking Siri.
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Does this mean the next version of macOS will be called 12.0?
No, 11.1, 11.2, etc. Just like with OS X (10)