I've never had a use for them and I've been working since 1999. :/ It's not a recent thing. The only people that need them are mass marketing vultures at trade

I've never had a use for them and I've been working since 1999. :/ It's not a recent thing. The only people that need them are mass marketing vultures at tradeshows. And there they will scan your conference badge anyway (Usually you must provide a phone number so I always make a "typo" in it). Everyone else I meet will just look me up on LinkedIn. It helps that my name is not very common.