I believe #2 was the main driver for the supabase team to build their real-time component: https://github.com/supabase/realtime
Background/announcement: https://supabase.com/blog/supabase-realtime-multiplayer-gene...
Background/announcement: https://supabase.com/blog/supabase-realtime-multiplayer-gene...
And we didn't want people schemas polluted with triggers.
But also we use Erlang distribution and Phoenix.PubSub because with a global network clients connected to the same node in the same region will get normal Broadcast messages to each other faster. If we ran them through Postgres or Redis the added latency wouldn't work for a global thing.