echo cancellation module does many different processes including noise cancellation, automatic gain control, and echo cancellation. When echo cancellation process is disabled(through method options) there is no need for a sink because other processes don't need it. Moreover, I don't know if it's possible but in this situation it might be good to provide an option to hide the original source.(It seems a bit confusing and a redundancy to have both denoised and noisy sources visible. I think it would be a good option to provide even if it won't be the default behavior.) BTW, see this relevant bug: https://bugs.freedesktop.org/show_bug.cgi?id=83557
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