I find that business cards are still helpful to get the spelling of people's names right - otherwise you have to either hand your phone over to the other person and have them type their name into your phone, or at least have them text you the spelling, which can be awkward to ask for and anyway has more friction than accepting a business card.
Also, sharing WhatsApp contacts makes me uncomfortable. There's various fields that people can store in their private contacts system which is inappropriate to share without permission - birthdays and home addresses at least. When you share a contact, you have to remember to sanitize the contact before you send it. A business card only consists of details which are pre-approved to share with strangers, so business cards don't have this problem.
One more concern for me is the utility of a business card is just once, if you want to contact them in future you'll store the details on your phone and when you put the card in the pocket it likely directly ends in the trash.
As for WhatsApp or other chat app 'contact' sharing it is not limited to business/professionals and so it has become a norm in several countries.
Yeah, I don’t really get the practice of sharing contact cards with people. A coworker sent me his once and now I have the names of his family members, his birthday, and home address.
Also, sharing WhatsApp contacts makes me uncomfortable. There's various fields that people can store in their private contacts system which is inappropriate to share without permission - birthdays and home addresses at least. When you share a contact, you have to remember to sanitize the contact before you send it. A business card only consists of details which are pre-approved to share with strangers, so business cards don't have this problem.