For me, the revelation that Lorca was from the MU stank of adherence to the "Roddenberry Box" that Michael Piller tried to enforce during TNG, in that the human characters must be squeaky clean with no flaws, and should any flaws arise there has to be a sci-fi explanation for them. So we have Captain Lorca, he's not a utopian nice guy. He's got rough edges, a blunt no-nonsense attitude and he chews people out when they try the "I'm an explorer, not a soldier" line that seems to fly with the rest of Starfleet. But rather than dare to have a battle scarred warrior be a heroic Starfleet captain, they go and make him be from the Mirror Universe to explain his gruff manner and adhere to the Roddenberry Box. Bleh.I think a lot of people mistake what motivated the Lorca arc (turning into a MU villain). To me, it was always clear that Isaacs had no intention of doing more than one season. So, they wanted to do something very unusual to take advantage of his limited commitment, like making the captain a frigging bad guy.
Ultimately, it's a ballsy and unique idea. Let's face it- it failed for many fans because the character was TOO damn likable / relatable.
Honestly, I think the fact that the Lorca Twist causes so much controversy confirms that it's pretty badass.
It also didn't help matters that as soon as it's revealed he is from the MU, Lorca instantly becomes a cartoon supervillain and unsubtle commentary on a certain real world political figure with his desire to "Make the Terran Empire Great Again."
Interact? Not really. Sarek does walk into the Katric vault where Amanda was hiding Spock, though he talks solely to her and Michael, with Spock sitting there rambling the Vulcan Doctrines of Logic and the coordinates to Talos IV.Did we every see Spock and Sarek interact in Season 2?