You missed the part where you ship it with the 10% covered and then those "edge cases" get reported by pissed off customers who keep getting alerted despite the

You missed the part where you ship it with the 10% covered and then those "edge cases" get reported by pissed off customers who keep getting alerted despite their notification preferences. Not to mention these notifications cross multiple devices so depending on how the teams are split there might be totally different teams managing the frontend toggles to change them and the backend services that persist those toggles... and then maybe a team or two to actually handle the sending. Maybe another team that's just dealing with the WebSockets - gotta get notified about new messages if you have the app open, too.