Discord, slack, et al would be doing the world a great service if their tools had notifications etc SWITCHED OFF BY DEFAULT so that they don't disturb other people in the same room as the user. Such notifications are designed to break your concentration / get your attention, but they have the toxic side-effect of polluting the environment of other people physically around the user, by breaking their concentration / getting their attention.
Being in the same open-plan hellscape as people using Slack means having to wonder who the hell thinks it's ok to be using a tool which makes 'knock-knock-knock' noises, and having to be that guy who goes around asking people to silence their shit. Yes, this is a human problem, but don't tell me the product designers didn't consider this. Either they did, and chose to leave it on by default or they didn't. Both betray a certain contempt for the user.
Another point for working from home is that one cannot easily distract others.