There have been so many dramas after Zindagi Gulzar Hai that resonated well with audiences around the globe.
Apart from simplicity and relatability, I feel they are cleaner that OTT series coming out of elsewhere right now. Like you can watch it with your family. Also, the traditional TV dramas in India have lost touch.
I also appreciate the brevity of the dramas. 30 episodes max and you get a closure. Same reason why I watch KDramas too.