It might have been suggested before. Similar to how it’s done in the latest version of Studio One (http://bedroomproducersblog.com/wp-content/uploads/2015/05/studio-one-3-routing.jpg)
Advantages of an audio splitter device:
Makes dry/wet knob on doofers obsolete (I think)
No more using 10 send tracks for seemingly trivial tasks.
Allows for more creative doofers.
EDIT: It should have amount for both the routed and the passed signal. That way you can use several audio splitters to split and “rejoin” anywhere you want.