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But shouldn't the app be programmed to maximize the chances that it'll work on the first try? It seems like a reasonable compromise to me. Annoyingly bright for a few seconds so I don't have to futz with my brightness.
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No, you cannot manually turn on HDR on iPhone.
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I mean, you kind of can... Isn't this what they are asking for?

https://dt.in.th/HDRQRCode

(View this on your iPhone)

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This subthread was about if the app should even show QR codes at maximum brightness because the scanner could maybe also scan the code at the normal brightness. And the counterpoint was that you can’t selectively increase the QR code brightness to the HDR level manually, because you would be capped at the normal maximum brightness.
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Blindly bright on my laptop on firefox as well
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I can turn the brightness up myself if the QR code doesn't scan.

Well, you're one person. How about the other eight billion people on the planet?

Everyone is not you.

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And… the would be the first to complain “my phone should auto adjust brightness for me whaaa”
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