"Apple is intentionally leaving iCloud data insecure" ... if you'd done some research you would know that iCloud backups are not end-to-end encrypted. That means you have a choice: backup to iCloud for the convenience and give up some privacy, or turn off the iCloud backup.
It would be nice if Apple was more forthcoming with that fact but there is some onus on the customer these days to understand what's private and what is not.
I don't think you are reading the list right. That is all the stuff that is encrypted both at-rest and in-transit (with keys known to Apple).
The list of E2E is further down, separate from the table, and includes: Home data, Health data (requires iOS 12 or later), iCloud Keychain (includes all of your saved accounts and passwords), payment information, QuickType Keyboard learned vocabulary (requires iOS 11 or later), Screen Time, Siri information, and Wi-Fi passwords. So virtually nothing, by comparison.
Messages, probably the most personal and relevant for legal cases, are end-to-end-encrypted as well, but if you have iCloud Backup enabled, the key is stored in the backup, making this useless.
It would be nice if Apple was more forthcoming with that fact but there is some onus on the customer these days to understand what's private and what is not.
https://support.apple.com/en-us/HT202303
iCloud backups are not on the list of end-to-end encrypted.