Comment by aeternum

Except it just happened. Boeing was found to have massive safety issues since they were granted the right to self-certify. It made a lot of news but nothing much changed, they can still self-certify a bunch of stuff.

Runway incursions and midair collisions are another example.

Only airliners are required to have TCAS, smaller planes and helicopters don't even need radios or transponders unless in certain airspace. Midair collisions do lead to fatalities, enormous fatalities if an airliner is involved.

Runway incursions and overruns are similar. They cause lots of fatalities and injuries but only the busiest and largest airports have automated systems to warn when a runway is occupied or end of runway (overrun) arrestor systems. Most still rely on human voice to deconflict.