I can finally sense the reason for Ahaan's longing for Ishqi - their soulmate connection. And I kind of understand them rushing into being together having realized that connection despite the fact not all their issues are sorted.
They are both very passionate people. Obviously they have a different way of expressing that, and yes one is practical, the other privileged. Ishqi shows her fiery personality on social issues and women's rights - as well as for basic 'getting by' in life. That passion had to take a practical form as she grew up without parents and in a household that was far from happy or familial. Ahaan is the same but with the overdose of Dadi's doctrine, his passion would show up in anger, judging / lecturing people and commenting on all that is wrong with them.
Usually passionate people go to extremes in situations because they cannot always have a control over their emotions. This fiery personality that both had is what got them under each other's skin initially. It wasn't the fact their views were opposing - but it was their passion that came out in front of each other, particularly when they were away from a crowd. At the time, it may have seemed they were at complete loggerheads... but their innate need to make the other understand, appreciate and agree on their stance always signified something more.
The spark only happened because there was a dormant flame inside each other and as time went on both Ahaan and Ishqi realized there was definitely some "chemistry". As luck would have it, both showed their real passionate side when they were high, and it lit that fire of passion even more.
Now that they are in a place of love, that passion can be seen by all. Ahaan is over the moon knowing he has finally met his match - someone who he can just be himself with - someone who senses his turmoil and can actually be strong enough to support him - and alas, someone who he can passionately love and care for the rest of his life, for he knows Ishqi is capable of the same.