Ask HN: How do you feel about Slack developer communities?

I've noticed quite an increase in non-commercial project developer communities that use Slack as their primary medium of communication, particularly for help and developer-related inquiries.

My gut reaction to this is a negative one, where I feel like the siloing of developer releated questions and answers is against the nature of the web, and more importantly detremental to the community itself, as it prevents discovery of previous discussions in forums, Google Groups, Stackoverflow etc.

How do you feel about these?

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