iMessages are already E2E encrypted, but you are correct, iCloud backups are decryptable with a warrant (and that was reportedly added at the FBI's request). But I agree with Ben Thompson's point in that blog post, that it's OK to not have strong, unbreakable encryption be the default, and that it's still possible to use an iPhone without iCloud and get full E2E.
But with Apple's CSAM proposal is NOT possible to have an iPhone that Apple isn't continuously scanning.
iMessages are already E2E encrypted, but you are correct, iCloud backups are decryptable with a warrant (and that was reportedly added at the FBI's request). But I agree with Ben Thompson's point in that blog post, that it's OK to not have strong, unbreakable encryption be the default, and that it's still possible to use an iPhone without iCloud and get full E2E.
But with Apple's CSAM proposal is NOT possible to have an iPhone that Apple isn't continuously scanning.