Visual Separation is a recipe for a collision. The US ATC use it far too often, setting a trap for many an unwary crew. At night, in complex and crowded airspace, Visual Separation should not be used. I nearly came a cropper in daytime at MCO, when my gung-ho CM1 accepted it just as we entered cloud while joining final approach at 8 miles. So the blame can lie on both/all sides.
Remains to be seen here.