Conversations involving multiple participants, allowing collaboration and information sharing in Teams
To me, this feature is not something funny. It is a help to get someone's attention about something urgent. Often I do not notice that I have received a new message, and I know this applies to others as well. Of course, the receiver has the option to turn off the feature, and it is not possible to nudge more than so often. This is also what it used to be in the old messenger.