How companies structure organisational memory is down to culture. People need to understand the benefits and limitations of a tool like Slack and behave accordingly (most users even struggle to use threads appropriately).

Slack is perfect for agreeing on simple, reversible decisions that don’t require much context or structured debate. I doubt you’ll ever be able to remove that just-in-time feeling from Slack’s user experience. Its UI is just not made for deep thinking.

But any long term thinking should happen in tools like Notion, which is better set up for long thinking, discussion and structured documentation of decisions.