Robert Comsol wrote:
I start believing these conjectural subspace relays are inevitable to rationalize these delays in communication.
I'm not sure "conjectural" is right word. We know for canon fact that they were out there. Epsilon 9
appears to be just such a facility. And in TNG, the events of the episode "Aquiel" center on a subspace relay station. And, regardless of how one may or may not feel about Enterprise
, wasn't there dialogue regarding dropping subspace relays along their path? I think the canon regarding the presence of Subspace relays is pretty solid and doesn't need to depend upon any conjecture.