I feel like a business card is something physical to hand people so they have it to look back at later. If you're just looking to NFC tap your contact info onto people's phones, why wouldn't you just use your own phone to do it?

This reminds me of something tangentially related. Sometime around the turn of the century I worked at a small business where some vendor came in to solicit interest in his business' services, and left a working CD-ROM business card. That mildly impressed the manager because CD-ROMs were still pretty fancy and nobody there had seen a business card like that before, and when run the card had some simple Flash-like slideshow thing with a little video clip or two about their business (which was still impressive when you couldn't really have embedded video clips on your average dialup-friendly website.) Around a week later that same vendor returned asking for the card back because "they're pretty expensive to make and I want to give it to my next prospect," and the manager's impression of him went from mildly impressed to thinking this guy was too hilariously amateurish to bother engaging with.