If split train is run, Hassan gets some connectivity to new locations. Nothing wrong in running split trains. There are many split trains even now. Kaveri has slip coaches from SBC-MAS, Goa express slip from UBL, KCG-VSG/YPR, VSG/KOP-SBC Chennamma and our grand old SBC-UBL/HPT passenger and many.
Instead, if split trains from MYS and SBC are run, it will definitely benefit MYS passengers. Why to take passengers all around Karnataka when their destination is somewhere else? They are not tourists who want to roam around.