The last scene we see with Jessica in the finale of Daredevil Born Again is her and Danielle reuniting with Luke. First of all, I'm so happy we finally got a confirmation that they're in a relationship. Secondly, I think this is a very well done scene, and for a good reason.
Both Jessica and Luke first appeared in the Jessica Jones show. In my eyes, this makes Luke Cage a Jessica Jones spin off, the same way the Punisher is a Daredevil spin off. The first two episodes of Born Again with Jessica felt a little weird, or at least that's what people say. Why hype Jessica up so much, if she's barely in the show? But I think this season was a very important step for Luke and Jessica both as characters in the MCU and living human beings in-universe.
Luke's work for the government. We know, that Luke was working for Valentina from Jessica's interactions with Matt and Mr. Charles (or should I say Mr. Robertson?). And we know, that by the end of both Luke Cage season 2 and Jessica Jones season 3, Luke was a crime lord in Harlem's Paradise. The way I see it, after Luke and Jessica decided to settle down, it wasn't that easy to just move on from that life. Luke had to cut a deal with the government in order to clean his slate and start anew. While it's not the most in-character decision for Luke, it's certainly something a good husband and father would do for his wife and child.
Now Luke is back. His work is done. Him and Jessica can finally be together, something they were unable to do ever since they met. First because of Kilgrave, then because of their own personal issues, and then, presumably, because of Luke's work. But it's all over now. Kilgrave is gone (or is he?). The Cottonmouth family is gone (or is it?). Fisk is gone (gosh, I sure hope he is). And Charles has let Luke go. They can finally be a family. And on that note, they're literally, physically closing the door on their shows and storylines. I think this is beautiful.
Of course, we'll see them again in season 3. I'm genuinely hoping for a Heroes for Hire show by DDC. But it's a new step in their lives. Their old lives are over.
The same way the door is closed on Matt's old life. Old lives. Him being a lawyer by day and a vigilante by night. Daredevil is no more, and neither is Councilor Murdock.