I don't know exactly in what context u have made this post...but yeah, I agree with u to an extent.
I agree chemistry does't depend on looks or experience or off-screen equation only.
But I would like to add one more point, that might be only my view, but the on-screen characters and story also matters a lot for a couple to be popular or for their chemistry to be seen. I strongly believe in this. Now AdiZa is an established pair n we might like them even if they are casted in another show with not-so-great story n characters. But when its the first show of any pair, only compatibility on all the levels doesn't work...the characters also need to be very strong for the pair to be popular.
I'll be honest, I didn't like Aditi much in the beginning, she was good in emotional or her lady don scenes but I would always find her very off in light-hearted scenes n plain blank in romantic scenes. So I wouldn't find her a good match for Zain. Gradually she grew leaps n bounds n then I started liking them as a couple and later when I started following them off-screen, it added to my love for them. Even Zain...I liked him since the beginning, but not as much as I liked him towards the end. But it was mainly the way their characters written n shaped...the way this pair was explored, hence I loved it more.
N chemistry can be between any two actors. It should not be necessarily between the lead pair. I'll say, chemistry is only the way one actor reacts to the other, be it verbally, physically or emotionally. Chemistry is being spontaneously natural...that's it. Then even the unconventional, unfitting, mismatched and unforeseen duos also turn out to be very popular.
N having said that...I'll say, the popularity of any pair, chemistry of any pair is a very subjective thing. Every fan feels their fav is iconic n popular n have the best chemistry. There are only few like SRKajol who r truly iconic. Frankly speaking, not even AdiZa are iconic. It is just we fans who feel they are iconic, but they surely are popular, not iconic. If we consider even the latest pairs, DivAn, NarBhi, ShivIn, HarshJen, Sharica, the yudkbh couple and AdiZa...all are very popular n fans of every pair feel their's is the most popular n iconic n have the best chemistry. But iconic is something, that name it n the whole nations knows it, isn't it? Something like Tulsi Parvati ladies, maybe?😆