Apple is notoriously tight-lipped about what their updates are actually addressing. Their standard release notes are usually light on details. (Which keeps their proprietary software private.) But iphones are pretty much everywhere, so they are often the target of malware. And tweaking their operating system while patching security issues can minimize those threats while simultaneously making it harder for malware developers to build off of their prior work. So the reason the updates are larger than necessary is because they are doing more than Apple is letting on.
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