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Na, was normal in the UK to have A4 too

I think you misread, the fact that the UK is in the Anglosphere strengthens the GP's point

> Growing up in Australia, every computer I’ve ever owned has defaulted to “US Letter” as the paper size.

I'm not sure how; the UK is an Anglosphere country that uses A4 and desktop machines as far back as I can remember (mid 90s) also correctly defaulted to A4 when printing. I suspect it's more likely to be that there's been English (UK) and English (US) options in OS's for a long time and Aus got defaulted to English (US) rather than English (UK) which carried some settings that weren't correct by default.

Trail paper was letter format in europe.

PC LOAD LETTER