You probably accumulate apps on your phone over time, and you likely had a perfectly good reason for installing them at the time. How many of those apps do you actually need, though? The Play Store knows, and it's starting to tell users to ditch those unneeded apps.
The notification is far from universal, but that's par for Play Store features. This feature may or may not roll out to everyone, and you might never see it if you keep your phone light on apps.
