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Maybe the guy has a local TimeMachine snapshot, I disabled local snapshots.

You can’t disable local snapshots in 10.13 on APFS, FWIW. But that’s neither here nor there, since those snapshots are irrelevant to the original, questionable claim:

Mac OS takes up over 100GB on my Mac. I know it could be compressed to around 60GB or even less, but clearly that would not remotely fit on any phone.

There are no vast differences in the software architectures of iOS and macOS that would make one hard to fit, space-wise, on the other.

It’s also still unclear to me just what people are talking about with such a change, since they’re basically describing what iOS has always been. Steve even said, when first introducing iPhone, that it “runs OS X”.
 
Notably, this turned out to be correct:
It was delayed a week due to a critical patch for certain high visibility security threats disclosed this month.
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If you don't want to share this info with anybody i suggest you keep your mouth shut in the near future when it comes to Apple's MacOS update releasedata.
If there is one person here that needs growing up it's you.
People asking friendly for a source and you give them this dumbass answer.
There is absolutely no reason to bite somebody's head off for asking where you get your info from.
Hi, not sure why you got all upset here but I will ask you first before posting any more. Thanks.
 
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