Star Trek Theory - The Disturbing Truth Of Picard
Picard's Role
At one point in the trailer, as spotted by one eagle-eyed Redditor, we see a rock formation behind Picard that closely resembles a rock formation in the Season 3 Star Trek: The Next Generation episode "Who Watches the Watchers." This episode introduced us to the Mintakan, a proto-Vulcan society that lived on Mintaka III who lived in an undeveloped society removed from technological advancement. It would make sense that they would exist in this story to offer an counterpoint to the evils of technological advancement. This is, after all, a Frankenstein story to end all Frankenstein stories with the Romulans reimagined as the over-reaching scientist.
As another consideration, Picard's special relationship with the Borg make him the perfect candidate to not only look after Dahj but also to thwart the Romulans as they seek to exploit the Borg to their own ends. Because it brings his own experience full circle.
We already know to expect Picard to be a politically loaded show - especially after Star Trek Discovery was so notable for it - and the "plight" of the Borg offers the Star Trek universe an opportunity to address the biggest flaw in its single greatest character's story. Because while Picard was one of the most intrepid, empathetic and positive captains in Starfleet's history, he was also unable to fully empathise with the Borg as an alien species because of his experience. They led him to uncharacteristic outbursts and emotional blindspots - they made him lose his cool, basically - and he clearly has PTSD over his experiences even as he tries to co-opt them into his armoury at times.
What if this story was a chance for him to see the Borg as a race of beings in more conventional terms rather than as a singular weapon? Bringing back Hugh and introducing Dahj - a Borg-linked humanoid with even more resemblance to himself - offers a mirror of Picard and a means for him to be more empathetic. Here, the Borg would be cast as the "outsiders" - a pertinent allegory for the immigrant story in the Western world right now - and him wanting to address those ghosts would be a strong explanation for why Picard would ever come out of retirement.
This would be his means to close out his story satisfyingly and to potentially save the universe in one fell swoop. What better mark of him as a captain than that?