I don't think they wanted things to be sorted out, per se but left it open-ended to be able to adjust according to number of episodes to be written. They could have them work through their issues for another entire year, since there was more than enough material for it, or they could short-circuit this by making everything fall apart and use season 2 to rebuild.
Don't get me wrong, I don't mind if endings are sad or tragic, as there is beauty in such storytelling and namukammal pyaar, but I just wanted it to be presented in a palatable manner. PB in fact could have gone either happy or sad ending and still done it brilliantly because they had 3D characters who were flawed. Depending on which aspect of each character's personalities they chose to address they could have fit it into the narrative whether things were meant to go up or down.
I don't even mind open-ended endings provided that the source material is done justice to. It's very very rare on ITV to have source material like they did with HS and Mini....so many layers and scenarios to work through.....even without getting to the issue of the label of father-daughter. If the writers always intended to keep them as this unconventional duo who felt these emotions for each other but didn't need to conform to a label for them......then the scenes should have matched that journey rather than abrupt fallout with the marriage. It could have been a lovely journey that way also but they kept playing up the angle of father-daughter finally finding each other....and now suddenly it's become about people who were never meant to be together.
Now they've tarnished the equations so much that even leaving them open ended wouldn't be some kind of "literary victory" if that's what their intent was.....
I have no issue with tragic endings either provided the execution has a level of emotional fulfillment.....which in this last phase hasn't really happened much.....the show has mostly tanked since the wedding because HS-Babita's superficial equation and HS in pandering mode took away the opportunity to build anything meaningful for the overall family and trio together.