No, you are wrong. Did you read the support article you linked to? iCloud and iTunes backups are both missing the same things, ApplePay and TouchID data, for security reasons.
There may have been a time when iCloud backups were less complete than iTunes, but it's not true anymore. And I want to be clear that we're talking about backups, not syncing, which is a different process.
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Android doesn't manage its own RAM usage, by shutting down unused apps? Wow, I had no idea! So you have to kill them manually?