Basecamp offers an interesting take on this. Basically, treat your office like you would a library, regardless if you are a maker or a manager. Too bad most don't have the discipline for it.

I've recently been stuck in the purgatory between the two schedules, having to manage a small team and do my own work at the same time. Totally ruined my productivity. I wish it were as easy as finding the right productivity tool...

I know what you mean. The Basecamp approach applies even if you don't have a physical office - we work remotely most of the time, but have similar "library rules" in place for Slack. Took some time to get people to follow them but it's not impossible.

I wish we could quit Slack altogether. It makes it too easy to people to disrupt each other's work. Unless the office is on fire, send me a well-formulated request instead of doing it one line at a time and flooding my screen with popups.

Just turn off notifications.

+1 for writing things down instead of scheduling a meeting for every little thing. At my previous company, every day started with a massive 30+ people standup -_-