I get that a lot of people see Slack as a panacea for all communications, but too often it ends up a dumping ground for anything and everything for which searches might not be as effective over time. Also, that data in Slack can and will be a liability risk to you when it comes to data privacy, compliance, and any litigation hold requests. Do understand that larger organizations (especially FAANG) will purge slack conversation data after a certain period of time for these reasons.
Finally, I feel DHH's article on group chat still provides valid criticisms and recommendations to retain your sanity and prevent the feeling of FOMO: https://signalvnoise.com/svn3/is-group-chat-making-you-sweat...