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These notifications drown out messages and even for moderately sized team, hinder the General channel. Someone else has also pointed out that the competition, such as Slack, allows you mute these messages, and you also have an HR issue about confidentiality / privacy (particularly where people have been let go, or key staff members resign).
1. You have channels - why not use one for leavers / joiners / group membership if you must do this?
2. Recommend that a Team is only used for 4-8 people to stop the flood of messages.