We had been using Slack at a job and that was plain horrible. Say something, it drowns quickly pushed away by newly arriving messages and nobody ever remembers

We had been using Slack at a job and that was plain horrible. Say something, it drowns quickly pushed away by newly arriving messages and nobody ever remembers the problem you've mentioned unless you repeat times and times again. I've quit the job because of this. If there was a tree everybody would see an outline of problems and comments that have not been answered would be hard to ignore. IMHO chats are handy for casual personal communication and absolutely unsuitable for a meaningful conversation involving more than 2 people.