You're in a rush in the morning and you leave home without your badge.

Happens to me at least once a month. But I almost never don't have my phone.

Key cards/badges don’t have GPS in them and can’t keep tabs on you outside the office.

it's sold as harder to copy (and easier to revoke when you're doing layoffs - which shouldn't have been a really challenge for card-based systems, they're just old and didn't keep up.)