Having specific fields that are validated or formatted helps with consistency of entry.
While I’m only mentioning phone numbers and addresses, there are probably other fields that would qualify for this as well. Like credit card numbers, or SSN, or whatever.
That being said, for some of those higher security items, it may be nice to have some way of password protecting that data. So it can only show to those who are supposed to see it. I don’t know if Asana is even setup for that kind of security though.