So me being me, I said "Really, T-Mobile has had that technology for several years." I got a dirty look, then the lady finished, gave me my phone and didn't say another word to me.
You were far, far, far from the first person that month to say that to the sales rep. Having said that, even for Verizon phones, there's been a machine that can copy your info from phone-to-phone, even across carriers. It's called a Cellebrite UME and they've been made by the Cellebrite company since 2000. VZ, or whatever franchise agent you dealt with was just too cheap to buy one (to be fair, a UME runs almost a grand).