Unused: As far as I am concerned, I have over 20% of useless fields, especially under Internet section (e.g. Gadu-Gadu, MSN, AOL... except Jabber, which is the only one I use); I would like to set fields by myself, an not having fixed fields.
Missing: I have missing fields, such as Role, which is a filed under Work section in Contact Information of XMPP (online form of vCard file in XMPP).
I would like to set my own fields (Name and ID) and have an option to restore default fields if needed.
This would be very helpful. Some of the fields make no sense nowadays like MSN and others that are more relevant today like Twitter, Instagram (which I don't use but many people do), Telegram, etc.