Business cards are much better than exchanging information. You can slide the card and continue talking about a topic without pausing and discussing numbers.
good point - you are basically arguing against extravagant alternatives that would break the flow of conversation as people are so cute sed to seeing and taking business cards - what I fear is that the automatic reaction continues after a meeting by dumping them all ...
iOS 15 camera with text highlighting is a killer feature here, and maybe people will start taking pictures of business cards to get info before discarded. Maybe an app idea here, idk.