I think it may be because it is no longer necessary. Simply type the first letter of any name or address of any contact and an interactive drop down list of ALL names and addresses that begin with that letter are shown. . . for example if your friend is Ann or her address is anniejones@abc.com, simply type "a" and a list of all your contacts under "A" will be shown, including emails you've received from senders beginning with "A" with preference to those you most frequently mail to or receive mail from. Unfortunately, I agree they have not even left the icon in those you can add. . . but "Contacts" is on your Dock. Simply invoke it from there and you can browse it from there. That works.
Every mail app,Yahoo,Gmail all of them have this capability.
Somebody F’ed up
Before I could click the address icon highlight 1 or 20 recips and it would automatically populate the header I chose.......
Replacing one step with 2 or 3 is not an improvement
Sorry,I don’t agreeThey screwed up.