I don’t have ADHD but I get very distracted by Slack. Here’s what worked for me. 1. Slack app uninstalled on my phone. If I need it for something, I install it, use it, then delete again. 2. Slack app on my laptop fully closed by default. 3. Set times (about 5 a day) to check in and respond to notifications and scan channels. When I was a senior manager with lots of actually important messages these blocks were about…
I'll add to this that if anyone involved with Slack is around here, Slack is in desperate need of more powerful/flexible muting controls -- ie, not just muting notifications from specific channels/DMs, but actually doing things like suppressing visual indicators in the sidebar, muting during certain time periods, etc... You want to go wild, it would be great to be able to fully turn off channels client-side during certain periods of the day so that new messages literally won't show up until it's turned back on.
When I used Slack, if it was open and there was an indicator for a channel, I checked that channel. It didn't matter if I got a notification or not, the indicator itself was enough to distract me.
I suspect there are a lot of people who have become less productive because of issues like this. A lot of the advice in this thread mirrors the above comment where people feel like they need to completely close the app and get it out of their face entirely in order to concentrate. In my opinion that's a weakness of the muting/UI options, that the only way to really truly tame notifications for deep work in many instances is to completely block the entire app.
Edit: I consider both of these problems faced by OP (https://news.ycombinator.com/item?id=34018044, https://news.ycombinator.com/item?id=34014517) to be primarily UX problems that Slack could fix. Definitely the notification indicators -- putting a bright red dot on someone's screen is a distraction regardless of whether or not you also play a sound.