>perspective of space debris and space sustainability

PRC are being careless in 800km orbit, which is actually much worse, but historically that's where US / USSR abandoned debris, PRC still small %, either way it's just stopgap for reusables, they obviously can't hit 200k mega constellation without reusable tempo. In meantime no point reengineering end of life vehicles since reusable replacement likely going to be done by then, especially at risk of missing delivery/capability to keep ITU filings, or worse, lose them to competitors (US).

Lets be real, space is being soft weaponized post SpaceX/Starshield, space debris/sustainability can wait, launch is realpolitik now. Much more important to be competitive = reserving prime orbits ITU has available in limited quantities, first file first serve. Starlink's done their own orbit squatting, PRC simply making sure strategic LEO isn't monopolized by US mega constellations.