For the chat service I was talking about before, the idea was that the 
javascript for the main page would ping the chat server and if it didn't 
respond, the chat ui wouldn't be shown. With services, I can have graceful 
degradations for each service at multiple levels. For instance, if the chat 
service was way over quota I can simply have it return 'empty' values that 
say no one is online or something like that, or even simply take it offline.

It seems to me that splitting an app into services would increase its 
reliability, not reduce it.

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