Comment by m4rtink

In practice the lower cost of access to space had made it viable to star requiring people to at least deorbit their upper stages, something that was long a no-go, with the excuse being that the extra fuel and redundancy would eat too much into the payload mass.

Nowadays it is generally frowned upon if you leave upper stages in orbit or if your satellite fragment spontaneously. There are of course exceptions (like some chinese launches leaving massive core stages in orbit that ten randomly fall back a couple months later) but AFAIK the situations seems to be actually improving due to the added robustness, that was only made possible by cheaper access to space.