[bdunbar]

> Won't NFC on a phone suffice?

Cost. Now everyone who needs badge access _also_ must have a smart phone.

I guess you could make it a condition of employment, then you'll probably pay each employee a stipend to have a phone and that's probably more expensive per employee than a badge.

And you'll run into guys like me who really don't _want_ to carry a phone 24x7 and get surly when we're told 'it's a condition of employment'.