The most important productivity tool I have is ignoring people.
90% of messages/requests I don't need to explicitly action (probably 80% of slack messages are followed an hour later by "oh I figured out the answer").
Human nature; if you have a problem there is a linear scale of effort:
1. Do I just know the answer
2. Can I trivially find the answer in under 10s
3. Who will know the answer?
4. What research will it take to learn the answer
90% of messages/requests I don't need to explicitly action (probably 80% of slack messages are followed an hour later by "oh I figured out the answer").
The 10% will follow up.