That's actually a terrible comparison because analog voicemails on a tape recorder aren't indexed, and aren't easily searchable. They'd be an enormous pain to slog through.
There are very many reasons why someone would choose to maintain their entire history of conversation with any one person, or even many people, or even everybody they work with.
And there are also reasons why I don't want to manually delete messages after I've read them, either.
Anyway, I'm glad iCloud Messages is getting closer to public release. I hope it merges and syncs my
entire archive of messages, between my iPhone X, iPad Pro, and MacBook Pro.

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Phew, this is good to read. I'd been wondering how they would handle this. (I saw the comments in this thread yesterday indicating that it might
not be syncing older messages, and I was like, uh oh...)
Can you confirm that it's
merging older messages from multiple devices? If I had "conversation A" on my laptop and "conversation B" on my iPhone... after iCloud Messages does its magic, will I have both conversations on both devices?
Thanks