I think they focused more on ASR character and to some extent on his sister and mother. The other side characters they just add for trp and to take the story forward.
Initially when BM and BD came to Rathore mansion she didn't have mile long sindoor. It was after a couple of episodes they showed she is married but no mention of her family, only focused on BD.
I want to know why she wants the money of ASR....are Rathore's rich by family or just Aryan 's father was rich like self made billionaire.
I agree the storyline or the characterizations is not well written but that maybe because they can have the freedom to add or remove. As like I have read in comments even Tripathi house few characters just disappeared into thin air. The production house will have many challenges and no individual can predict what's gonna happen in their personal life or what situation arises.
So yeah creative liberty and all ....the audience gets served with this half baked storyline. Everything can't be perfect in real and ITV is known for this. Like we didn't know Narmada was working, Arpi was topper and she was working, they will just let us know through some dialogues here and there. Budget constraints will also be there, so i take everything with a pinch of salt....if you don't like it then we can always be on and off the serial. But in general we fall in love with one character and build up too much expectations and feel let down when they creatives for the sake of trp show us anything, case in being Narmada becoming dumb...and nowadays for past month or so Imlie tracks are being shown at super sonic speed.
At the end of the day it's all a business not some serious content show which is giving a social message, for everyone its job for which they are paid.