Greenify is a great tool to have so that you can have a broad selection of apps on your device without worrying about it weighing down the OS in bloat. Lots of apps unnecessarily start in the background or ask to be notified on state changes or when the device is unlocked, which can lead to sluggishness and/or battery life degradation. For example my banking app does this, and I never need my banking app to run unless I explicitly press on that damn icon. But I don't want to get rid of my banking app due to it's bad behavior, because it's truly a useful app. That is where greenify shines.
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