The T-64, T-72 and the T-80 have been built by separate companies. The T-72 (Morozov Design Bureau)was less expensive and complicated than the T-64(Kharkov Transport Machine Plant). The T-64 has not been exported. Which could mean that it was technologically more advanced than the T-72. If I am not mistaken, the primary use for the T-64 was for the 'defense' of Russia. I am not sure if that means it was superior though.
The T-80 (Leningrad Kirov Plant)was developed to further the T-64. It is more an upgraded T-64 than a T-72. Sort of like the T-90 developed from the basis of the T-72. I really think that the T-64 was far more advanced than anything that NATO developed during that period.
There has been no further developments of the T-64, which numbers were close to 8000. Which could mean that it is being phased out like the M-60 tanks have, here in the US. I doubt it would be a front line tank.
There are no rocket launchers on any tanks.