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this post was submitted on 16 Mar 2024
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It's mostly a power efficiency thing. Before push notifications were the norm, most apps used a polling method. They had the application send a request every X seconds asking "anything new". There wasn't coordination between apps, so even every app checked once every 30s, it likely wouldn't be on the same 30s. This caused the device to wake up a lot and never let it switch into low power mode.
A push notifications system like FCM or UnifiedPush means only a single application needs to run in the background. It maintains a persistent connection to the push notification service and waits for a message. When it receives one it wakes up the relevant app and passes it the details.