Along with key HomePod improvements, Apple introduced Messages in iCloud with iOS 11.4.
It a useful feature designed to store your Messages and attachments in iCloud, but enterprise users should think twice before enabling it.Security is everythingI&m not saying iCloud is not secure — so long as you use a six- or more digit passcode or (better, but more awkward) an alphanumeric passcode, it highly secure.
I&m reasonably confident a strong password, Apple own systems.
and its insistence you use two-factor authentication is enough for most of us.