Also is there a reason they can't just use this piece of hardware to brute force the phone?
https://www.intego.com/mac-security-blog/iphone-pin-pass-cod...
https://www.apple.com/business/docs/iOS_Security_Guide.pdf
The short version is that your passcode (whether four digits, six digits, or a full password) is combined with an encryption key embedded in the device in a way that's supposed to be impossible to extract, and used to derive the encryption key used to protect your data.
The device you linked to relies on a vulnerability in the US, where it would report that a passcode entry failed before recording that failure to nonvolatile storage. Normally, the device starts adding more and more delays to passcode entry after a few failures. By cutting power to the device immediately after it reported failure, it bypasses those escalating delays. As your link mentions, Apple fixed this vulnerability in a subsequent OS update, so that hardware only works on older OSes. This phone's OS is too new.
The only reason brute forcing is even potentially an option in this case is because the person in question didn't bother to use a secure passphrase.
So, it sure sounds to me like iOS is already doing what you describe. Do you just object to giving the user an insecure option?