Make conversations public by default. If you use Slack, make team channels, project channels, announcement channels etc. all public. Discourage 1:1 and private communication unless really necessary, especially for engineering topics. This single change will have an immense impact on overall company culture.
This contributes to stress and notification fatigue, especially when bombarded with alerts from every channel. Some will turn off notifications entirely or disengage to maintain focus on their workload.
There are in betweens here, with the major one being threads in slack. Everyone gets notified about a single message at the start of the thread, but does not get notified for any subsequent discussion. Any interested party can read more and participate as needed. For someone like me (a leader on paper but not really in practice), I'd read all the message and look for dependency or similar problems, but for others they may not need to.