The short version
Keep the group for talk, cheers and quick questions. Count the week in ActivityTracker, where the numbers add up without anyone scrolling back.
Who should stay with which
Stay with the group alone if
- you're a team of two or three who sit together every day
- you only need to share news, not count anything
Add ActivityTracker if
- you ask "how was your week?" on Friday and piece it together from messages
- a rep goes quiet and you notice a month later
- you want the week's rankings in the group without typing them up