In the current scenario where businesses are going digital, meetings are conducted on skype and zoom, presentations are given over the screen, and workshops are conducted remotely; one should not assume that conventional business methods and data will lose importance.
The need to maintain these details will remain unchanged. You still need to have your client’s formal name and not just their twitter handle; you still need to have records of their postal address and not just their email address. Postal addresses are where all the physical documents and entities will be delivered to clients - and these addresses need to be valid. The relevance of having customer postal addresses becomes even more evident when documents of legal reference must be drafted and mailed.