Set your iPhone language to “English (Australia)” and then try to type some words.

Realize aluminum color

Those are American spellings.

For a company that obsessively auto capitalizes (argh capitalises) words like “FaceTime” and “Apple”, it’s hard to see this as unintentional. They employ many experts in language and internationalisation.

Someone, somewhere at Apple made a conscious decision to push Australian language more towards the US. They’re culture hacking us.

@mnot Of all the Apple spelling correction sins, “Quick Look” is the worst. I appreciate it’s a name of a macOS feature… bit I sure am glad I I never have to look at something quickly…
@mnot on Android the keyboard has a separate setting for input language, in addition to the "system" language settings. Does iOS have something similar?
@mnot can you share what your keyboard settings look like? This should work correctly when your keyboard is set to English (Australia). It may not auto correct but it should at least mark it as a spelling error.
@mnot To this day, the iOS spell checker does not support voseo in Spanish and will often do silly autocorrections if you try to use words like "vení". I've been hating that since iOS 2 or so.
Voseo - Wikipedia

@mnot I've had my phone and Windows system language set to English (UK) since I noticed this in Microsoft Word 25+ years ago in school. It's not just Apple.
@mnot Phone language and dictionary language are two separate settings. The former is what it uses for screens, interfaces, text to you. The latter is what it uses for spellcheck of what you type. Check the latter is set to English (UK). Windows sets it separately too.

@mnot Not reproducible on my iPhone. Red squiggles all over.

Edit: It is as @bastardsheep says, on experimenting. UI language (Settings > Language and Region) doesn’t affect spellcheck. Keyboard language (Settings > Keyboard > Keyboards) does.

@futzle @mnot @bastardsheep I wish that changing OS language defaulted the spellcheck language to be the same, so you only had to change if you want spellcheck different. Otherwise changing one would do both.

@mnot it’s okay for me

Realise aluminium colour.

The American spellings even come up with a red underline

@mnot Nope, always had Aus spelling on all those words (and others). Think you might have a setting wrong.
@mnot I recently received some input I enjoyed on a similar question. I was firmly in the "all actions performed with intent and malice" camp. Then the person I discussed this with offered the counter argument "laziness" as all the more likely because generally doing anything with intent, and with malice specifically, requires effort. It is much easier to just not think about stuff and do the least amount of work. This made a lot of sense to me and I believe my default position has now shifted.