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Their cloud-based Notes App is simply killer. Sure, it’s a simple app but I have had a flawless experience on it.

Photos is pretty great too, but I’m not sure how it compares to other photo services.

And yet they forced you to upgrade all your operating systems an all devices you own with the last Notes update (was it iOS 13?) or you'd lose data.

Because old notes synced through CalDev which required an iCloud email address

You wouldn't lose data. You wouldn't be able to access the new notes on the older devices.

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