> Never had a problem with sessions, a properly configured client starts them automatically.
Then you probably don't switch across clients constantly during a conversation. Or took *a lot* of effort in copying the key to every client on every device. This is a pain, and undesired labour.
> [...] someone sitting at my desktop could read everything.
Nobody said you needed to store unencrypted keys, on an unencrypted disk on an unlocked computer.
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