right?
HoriZEN had z-transaction based messaging as one of the earliest features. They did find out that it does not scale very well though. Maybe this improved with Sapling.
Using the memo on transactions is a little problematic. 1. It will cause chain bloat for non financial transactions. 2. It's slow, with possible mempool issues, and could tie up funds while waiting for transaction to confirm because of the TX fee requirement. 3. It's permanently on-chain.
Older versions had a separate mechanism purely for messaging. It has since been deprecated
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