Slack is about empathy and creating a flexible enough design that empowers people to decide what kind of solution they want or need.
What legos, Amazon Web Services (AWS), Newegg, watch strips with more than one hole, height-adjustable chairs, and thermostats with turnable dials all have in common is that none of them presume to know exactly what you will want, but instead they provide the capabilities and resources needed for configure a solution that’s right for you — in other words they all built slack into their design.
Solutions and technologies that endure and continue to solve problems at scale are those that account for the inevitability of changing contexts and cultures.
Ben Thompson from Stratechery wrote a great piece on the idea of 'primitives' - a practical example of building in slack: https://stratechery.com/2016/the-amazon-tax/
He is! I encountered his content for the first time about a week ago, his takes are very well-thought-out and illuminating.
https://fs.blog/2021/05/slack/