See Legend credit card was once a premium card offered from IndusInd back then, but they have made it LTF and offered to the masses.
IndusInd cards have very less merchant offers and less reward rates cards. Many use IndusInd cards based on the lifestyle benefits they offer to different customers. Legend card will be entry pass to the IndusInd cards. Take it as LTF, no harm in holding it.
If you have limit more than 5L then you will get upgrade offers to other cards after 6 months.