What kind of web container (if any are you using)?

I'd say using ask and blocking on it is still an improvement with pre 3.0 
servlets.

With asynchronous servlets you can push the AsyncContext down in a message or 
use as in the ask future's onComplete callback.

With other frameworks (Netty, Jetty, Akka HTTP, non blocking 3.1 servlets, 
etc.) things will be even better.

There's just no need to use ask in other places, That's all. In other words it 
makes perfect sense to use it for the integration point between your existing 
blocking code and your new Akka based code and slowly change code to or add new 
asynchronous code. 

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