If somebody physically attaching to your device isn't doing so in an environment that doesn't also block radio signals, they've already failed... and you can't be wiping your phone every time it loses signal.

The threat model of a personal computer and the threat model of something that literally follows you everywhere and knows everything you do are very different.

Physical access is much easier to obtain exposes you to way, way more. Getting a divorce? Your phone is probably something you want to guard extremely closely. You can get someone to pin your android phone for low-double digit thousands of dollars -- or even free if it's the right kind of person with the wrong kind of morals. IMO, if you have any meaningful assets to protect, whether they're yours or your company's, buying an Android phone with JTAG pins is _insane_ (or simply poor risk analysis).

But what do I know? I've only JTAG'd a phone before, scraped the RAM, obtained the unlock code and all of the user data. Random thought: how many people do you know whose phone unlock code is also their ATM pin number?