The default is interacting in channels, not 1:1 slack messages. It is really, really rare that communication should happen 1:1.
• If you are asking then others likely have the same question
• And, asking in public channels lets many people help, especially across time zones
• Asking publicly makes it MUCH easier for new colleagues to ramp up
• Asking publicly makes it MUCH easier to understand historical context
:1 communication examples include critical feedback. Really nothing else.
If you find that there are too many notifications, then make your notifications silent… we need to encourage all of our knowledge getting shared.