Might be crucial to the plot by default - it's all about deniability, after all. The Romulan raider ships are supposed to look un-Romulan, and the consequences would be dire if the enemy could actually connect the ships to Romulus. There must be Plans B through Z in case of primary mission failure and enemy boarding of the raiders, and from the stumblings and fumblings of our Romulan antagonists in this episode, we learn what these plans are
not.
Yet said Romulans don't appear
too distressed when they learn about the boarding. Perhaps even if Starfleet managed to capture one of the droneships intact, Romulus would still be safe? Because, thanks to those forward-thinking Romulans, even the telepathic link would be...
...Not just a dead end, but actually another step of misdirection, pointing the finger at an alien species rather than at Romulus?
Maybe Vulcans, Romulans, and Remans used to all look the same, then they just split off into three different directions that made the Romulans a little different from Vulcans and Remans a lot different.
Or then the split happened on Vulcan, over millions of years, as isolated enclaves across the desert world found different ways to adapt. And then there were these big wars, with just a few of the subspecies surviving - and eventually the flattest-headed subspecies drove all others either to extinction or then to interstellar exile. And a few of them (along with a handful of their flat-headed sympathizers) ended up on the twin planets Remus and Romulus, but (to avoid the fate of the original homeworld, that is, of being pulled apart by racial strife) carefully segregated.
Timo Saloniemi