There is no reason that domain providers will be incapable of providing a contact point and you were always able to put a separate email inbox on WHOIS.
But there is no need for a full postal address of real email addresses that people might use for personal contacts or a real name. That just leads to more abuse.
But there is no need for a full postal address of real email addresses that people might use for personal contacts or a real name. That just leads to more abuse.
Same for phone numbers.