Why? Because lyrics like "Koi Mil Gaya" translated to "Oruvan Kidaithaan" often lose the rhythmic flow. However, for the Tamil dub to "work" on mass media (like television), they must re-record. Surprisingly, the re-recorded Tamil version of "Saajanji Ghar Aaye" (turned into "Kalyana Veedu Vandhaan" ) was a minor hit in Chennai local cable circles in the early 2000s.
The film was officially dubbed into Tamil under the title (retaining its original title) to capitalize on Shah Rukh Khan's growing popularity in the South. kuch kuch hota hai dubbed in tamil work
Here is a breakdown of how the Tamil dubbed version holds up: they must re-record.
Because the film is a cult favorite in South India, several independent creators and YouTube channels have released unofficial Tamil-dubbed versions of the title track and iconic scenes. kuch kuch hota hai dubbed in tamil work