[zeromq-dev] Why PUB and SUB sockets don't use multi-part messages?

[Dev Aggarwal]

I recently used ROUTER and DEALER sockets, which used multi-part messages
to separate identity of sender and the message data.

I personally, found this approach quite sophisticated.

But then, I found some use for the PUB and SUB socket pair.
I was surprised to see the examples in the guide not using multi-part
messages.
Instead they used concatenation to append the "TOPIC" to the main message
and then filter out based on that.

Is there a specific reason for doing concatenation, instead of using the
first part of a multi-part message?

Regards,
Dev
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