[rabbitmq-discuss] Should multithreaded application use single or multi channels

[rails]

My app has multiple threads that publish messages to a single RabbitMQ
cluster.
Reading the rabbit docs<https://www.rabbitmq.com/tutorials/amqp-concepts.html>:
i read the following:

For applications that use multiple threads/processes for processing, it is
very common to open a new channel per thread/process and not share channels
between them.

And I understand that instead of opening multiple connection (expensive)
it is better to open multiple channels.

But why not use a single channel to all threads?
What are the benefits of using multiple channels over a single channel?
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