Okay since the core module that was launched in this CZ-5B is the largest and heaviest singular payload in this station project, they probably didn't bother doing one off de-orbit since the next launches should have enough fuel for the first stage to de-orbit with relative accuracy.
As for the first stage that reached orbit, has there ever been (in history) a first stage of such significant size that ever reached orbit? Also I doubt they have calculated where it will likely land because they don't control it at all and it is in orbit. It's almost impossible to accurately calculate when and how it re-enters atmosphere. It's roughly got a 70% chance of ocean landing but could also land somewhere in Africa, USA, Australia, China etc. Two countries on the booster's flight path have the ability to shoot down any larger fragments that don't disintegrate - China and US. If it lands in a major population area in Australia, there would be justified anger and high costs for payment. Although the probability of that is less than 0.001%. It's like throwing a rock in the middle of a forest and then landing precisely onto a bird's nest unlikely.
They're not complaining because they don't do it... they've been doing the same since the 1950s. It's just that this particular rocket's upper stage is also its first stage and it is absolutely massive compared to the upper stages of American, European, Russian, Japanese, and other Chinese rockets that use much smaller upper stages. Not counting Indian because even GSLV has a fraction of payload capability and would have no reason to have more significant stages that end up in orbit.
As for the first stage that reached orbit, has there ever been (in history) a first stage of such significant size that ever reached orbit? Also I doubt they have calculated where it will likely land because they don't control it at all and it is in orbit. It's almost impossible to accurately calculate when and how it re-enters atmosphere. It's roughly got a 70% chance of ocean landing but could also land somewhere in Africa, USA, Australia, China etc. Two countries on the booster's flight path have the ability to shoot down any larger fragments that don't disintegrate - China and US. If it lands in a major population area in Australia, there would be justified anger and high costs for payment. Although the probability of that is less than 0.001%. It's like throwing a rock in the middle of a forest and then landing precisely onto a bird's nest unlikely.
They're not complaining because they don't do it... they've been doing the same since the 1950s. It's just that this particular rocket's upper stage is also its first stage and it is absolutely massive compared to the upper stages of American, European, Russian, Japanese, and other Chinese rockets that use much smaller upper stages. Not counting Indian because even GSLV has a fraction of payload capability and would have no reason to have more significant stages that end up in orbit.
