I'm too lazy to back with some links my following statement, but usually in industry diversity is good. There are many frameworks and libraries, that have overlapping use cases. But with more choice it's easier to get the right tool for the job. Also maybe this framework is solving the same problem in a more clever way. So: yes, it's good to have smart developers contributing instead of starting new projects, but it's also good to have more diverse frameworks to choose from.
After a quick look, IMO Watermill is a bit more flexible, because of middlewares and decorators support ;)
And what is unique, Watermill provides some high-level concepts like messages Router or out-of-the-box CQRS support which is really helpful when you are building bigger application.
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[ 4.0 ms ] story [ 31.9 ms ] threadhttps://godoc.org/gocloud.dev/pubsub
This has support for many pub/sub protocols.
Why reinvent something that already exists instead of just contributing back to an existing project?
https://godoc.org/gocloud.dev/pubsub/driver
And what is unique, Watermill provides some high-level concepts like messages Router or out-of-the-box CQRS support which is really helpful when you are building bigger application.