Never saw the feature, but from the description they simply looks like labels, but displayed inline with unlabeled email. E.g. imagine all emails from your utility company as a single long thread.
And the ability to take a one-click action on all of them in the bundle.
There were so many times that I'd snooze an entire bundle of emails about a trip until the monday before the trip, or snooze the 20 emails sent out from a work monitoring system that I need to look into later in the day, or archive an entire bundle of promo emails after glancing in them at the subject lines.
In gmail I hate the tabs because once I look at them they stop being shown as a count in that tab, and I need to select them all and archive them in multiple steps. And if you don't like the tabs, the only other way to organize is by foregoing grouping all together and throwing everything into one messy list.
There were so many times that I'd snooze an entire bundle of emails about a trip until the monday before the trip, or snooze the 20 emails sent out from a work monitoring system that I need to look into later in the day, or archive an entire bundle of promo emails after glancing in them at the subject lines.
In gmail I hate the tabs because once I look at them they stop being shown as a count in that tab, and I need to select them all and archive them in multiple steps. And if you don't like the tabs, the only other way to organize is by foregoing grouping all together and throwing everything into one messy list.