This is a nice feature when you have a group of multiple sites you need quick access to on the regular. For me, I manage around 12 websites in three environments ; dev, test, and prod. Being able to group the websites by environment keeps things organized and somewhat readily available at two clicks (maybe three if you count collapsing a group before opening another group).

Now, the team is experimenting with smart tab groups, a new AI-powered feature that suggests names and groups based on the tabs you have open.

I bet you one cheap bottle of mineral water they'll implement this like tomorrow