You know, I started watching to see how they were going to tackle ShiVi after marriage, even during prewedding days I was so excited to see how their intensity and history was going to get carried forward... I was practically buzzing with anticipation with the kind of pull they had.
Now, though, I find myself wishing wistfully they'd let the prewedding phase run for a bit longer, I really want to see more of that ShiVi now.. it's almost like I'm not invested in their marriage at all. Their backstory and all the what-ifs and their intersecting orbits are all I think about when I think of them! The way they've lost plot with the ShiVi storyline could be one reason, but even otherwise I'm superbly intrigued by their equation before marriage, and the possibility of it having progressed without the forced wedding.
I have the same sentiments as you. ShiVi were brimming with emotions and intensity. Emotions that could very much be analyzed in 10,000 different ways, all of which seemed plausible and correct. Though this is a remake, the makers decided to put a few childhood scenes/moments, and that is where I think I started expecting more from them. Every couple was unique in the show. GauRa were childhood friends, DevTa fell in love in college, and ShiVi were childhood frenemies. If the makers wanted, they honestly could have had a solid story of how ShiVi were both blind to realize the affection they had for one another.
Again, I know this is a remake, but I wonder what the possibilities would've been if Raavi walked away from the marriage. I would've loved to see scenes where Shiva helps her recover out of guilt from how things transpired. I know KD would've nailed those scenes. It could've been a great track where Raavi realizes that it was actually Shiva, not Dev, who has been there the whole time.
Another direction they could've taken the ShiVi marriage is just have scenes where Raavi and Shiva speak up for each other at random moments. For example, during the scene were Shiva was trying to steal the aloo gobi sabzi because it was his favorite, it would've been interesting if Raavi spoke up and said, "Aloo gobi sabzi? But isn't your favorite dish chole? You always took an extra helping at any party we go to!" and then have Shiva retort, "No one makes aloo gobi sabzi like my bhabi!"
Or even in the scene where Shiva comes up to her asking her what is wrong and who hurt her, I think it would've been sweeter if she retorted, "No thanks! You don't care about me, and I know just exactly how horribly you take care of things. Don't think I haven't forgotten how you've taken care of Rohan when we were in 10th class!" Those types of scenes really leave the audience to imagine what they can and will about their relationship, and that I think is the best type of writing anyone can do!