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A nice .@SlackHQ feature would be to flag messages for a digest. Like pin, except just indicating a message is key. Imagine then a "Weekly news roundup" for any channel.
Pinning doesn't work for this, as pins get too crowded too quickly, and they don't "age out". Imagine a weekly digest, being able to catch up on "the good parts" of a month of channel traffic in 5 minutes. .@SlackHQ maybe auto-add to digest anything with > 5 reactions
a lot of people use the Reacji Channeler for making digests and newsletters out of "best of" content in their Slack workspace. Ask everyone to put a 
reaction on great stuff, then review the channel once a week for the best bits! https://reacji-channeler.builtbyslack.com/
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