You mean a system where when you get misidentified (this will almost always happen at scale) you get effectively banned forever, across multiple games? Yeah... I think I know why people aren't keen on that.

(And yeah, I'm ignoring the general issue of how you id people, how you secure that data, what happens in a highly toxic game environment when someone breaches that, etc.)

That doesn't mean he is wrong. That _is_ the only way.