Why is it a huge stretch? Pretty much all species we see flying around in Star Trek have technologies that are purely physics based. Very rarely do you get stuff like Tin Man/Gomtuu, of which we don't even know who made it. Stamets and Straal's research made a huge leap to assume that at a certain level there is no difference in physics and biology, and about what the existence of the mycelial network might mean in terms of space travel. It blurs the line of biology/physics in a way we haven't really seen before in Trek (which is why I found stuff like the JahSepp's biological transporter really fascinating, because it was a new concept) . And from what we've seen of the science and technologies of the other Trek species, that leap wouldn't be intuitive for any of them. So, unless someone tells the, say, Borg about the drive why would you assume they'd research in that direction in the first place?