It's just... a bit late to dig into that much this season. while this season isn't exclusively Beren and Luthien, it is mostly Beren and Luthien. I don't dislike the idea of having them both imprisoned on T-i-G together, forming a bond even. We just won't have much time to focus on them much, early in the season. I can imagine a couple of great sequences of them stumbling from the ruin of T-i-G post-Sauron, introducing themselves to B&L. a scene of them debating if they return to Narg when, last they heard, C&C were basically in charge. They agree to part ways there, because GG wants to take revenge on C&C, while Oropher wants no part in that conflict and wants to distance himself from the Feanoreans. GG returns to Narg, and due to his temper and wanting to avenge his grandfather w/C&C, Orodreth sends him to the Havens. Oropher returns to Doriath, reunites with his wife and young son, and maybe move into Ossiriand by the end of the season.
Heh. I almost talked myself into it.