I think there is somewhat of a wild west on orbit. Even in the case of known, active missions the parties in a "potential collision" may have different opinions

I think there is somewhat of a wild west on orbit. Even in the case of known, active missions the parties in a "potential collision" may have different opinions about actual likelihood of the collision: "collision likely" usually means an estimate that both bodies will occupy the same 10-50m volume, but they may or may not actually collide. Based on this each party may decide whether they want to spend limited fuel on maneuver. Or take their chances. Or wait if the other party blinks first. Add a ton of sats launched by spooks from multiple governments and agencies (who do not want positions of their sats known and may maneuver more frequently) add a whole new layer to this. Just my 2c -- I am not an expert; current setup may be better managed.