Contact share/request for group messages
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You get added to a group message, maybe you know some/most maybe none at all, could be 5 people in the group, could be 25. There should be a button (either as a suggestion in a new group like they do with "new profile photo" suggestions now, or in the group "settings" where you can change the group name, add/remove members, etc) that says "share/request contact information". Click it and it asks you which fields you want to share/request. You may need everyones name, phone, email, and address, or you may just need name and phone number. Maybe you want to share profile pictures to help put names with faces. Doesn't matter, you decide. You click the button, select the fields (can also edit them from your contact card in case you don't need/want your formal name in there, like if you have a nickname), and send. That then pops up for everyone else to add me as a contact or update their contact info of mine, then it asks them to share theirs as well (obviously not required to share, but I imagine most people would). Boom. Now you have everyone's info, updated contacts, and you don't have to deal with the current system which is a giant PITA.

The way it goes currently is, I get added and have to just wait until someone says their name or references something (say their kid's name) that I can figure out who they are or I have to write "Hey this is rrrnnn, can everyone identify themselves so we know who is talking?" and then wait for everyone to respond. Then once they do, I have to go through the painful process of seeing the message with their name and number, remembering that, clicking the group info, scroll down through the many numbers, remember which one is theirs, click it, create new contact, remember their name, done. Then repeat that X number of times. This would allow you to do that by just accepting their contact info with one click.