We all know my first point - it was progressive because it advocated for widows against those century-old bigoted and stupid views but that's just the surface. It's progressive for their relationship.
There was a tear on Imlie's cheek when she watched Narmada and Arpita get shunned from the rituals. People in attendance (Meethi, Rupi, etc.) felt bad for the two, felt sympathy but it was Imlie who felt empathy. You could see it affect her personally as if it wasn't Narmada and Arpita who were targetted, but Imlie. Like Aru, her eyes were filled with rage towards Blue Aunty.
In the past, we've seen Narmada stand behind Imlie like a pillar of strength, even opposing Aru (when she believed he forced Imlie for marriage) and Arpita retort Imlie's haters (Mrs. Chautervedi at the New Years Party), but today the tables turned. It was Imlie who fought for them and convinced them, even when Aru could not. Likewise, it was Aryan's tear that fell on Imlie's hand and broke her heart. Before the tear fell, you could see Imlie clenching her fist, trying to restrain herself but when it fell and she saw how much pain he was in, she raised hell.
It was also progressive because we saw Imlie's feelings for Aditya fade and Aru rise. When Aditya applied Haldi to Malini, Imlie could barely watch because she was still in love with him. Today, she barely showed a reaction after the initial shock of him attending the event. Her face was sombre and still. She gave a bigger reaction to Aunty Blue (loved seeing Meethi try to stop Imlie from attacking, so cute). Moreover, that kiss pose had those two in their own world, in so much peace. The intimacy in that scene and their shared comfort spoke volumes for the trust she has. They lost themselves in that trance that they had to be broken out of by Arpita and like. It shows that the feelings are mutual.
But also Aru, Imlie's trumping you as my favourite this week so upp your game lol