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Why does a USB C port mean you don't need ADB or help with a cracked screen?

It's bad to leave ADB enabled in general.

With a USB C port, there's a near absolute certainty that you can simply plug in a USB hub with HDMI built in to hook your phone up to a mouse and monitor to get around the cracked screen issue.

The recent versions of Android seem to have gotten way better on ADB security. It seems to generate a keypair on every computer with ADB and require a user with the unlocked phone to authorize the keypair for each device manually. It also auto-revokes authorization if you haven't connected that device with ADB in 7 days by default.

I think the implication is that video output is usually available on these devices.

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