The problem isn't that "nobody" ever hears from the server again. The problem is that "not everybody" ever hears from the server again. If you aren't sure that

The problem isn't that "nobody" ever hears from the server again. The problem is that "not everybody" ever hears from the server again. If you aren't sure that the server received your write, but another system (that does have access to the server) depends on the result of that write.