Why no "default" editor in Ev2?

I'm working at experimenting with a simple Ev2 consumer implementation
(see the ev2-export branch). In doing so, I've once again noticed
that anybody implementing such a consumer has to implement every
receiver. We don't provide default implementations, nor a way to only
specify certain callbacks we're interested in. This is getting a bit
tedious.

Is this part of the design, or simply an oversight? Is there any
drawback to providing default no-op implementations of the various
receivers?

-Hyrum

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