Your assumption is that The cause was the plane, but neither Ethiopian nor Lion Air have great safety records in the first place. Parent’s point is that the FAA is likely to be more aware of whether the cause in the first crash was due to the plane, pilot error, weather, or any number of other factors.

[edit] Apparently I’m incorrect about their safety records - my bad, the one time I trusted a friend and didn’t look into it myself, haha. I still maintain that it isn’t clear yet that it was the plane’s design, but I retract my comments on the safety record. Carry on and please quit the downvoting heh. :)