The parent was saying the US approach instead define what a harmful chemical is after the fact. Leaving companies to need "insurance"/a cost benefit wager before something is built. Otherwise they could be screwed later after litigation.
IMO, I can see both sides but preferably I would want simpler laws from political processes which are then refined into explicit interpretations by subject matter expert strong government institutions. But we have lobbying/revolving door government employees and trashy textualists in the US so it doesn't work out that way...