It’s like the old “5 Whys” technique for getting at the root of a problem. But as you suggest, there may not be a root: we can always push “real” causality one

It’s like the old “5 Whys” technique for getting at the root of a problem. But as you suggest, there may not be a root: we can always push “real” causality one level down. Whys all the way down. But that doesn’t mean we can’t answer the question of why something happens. A cause doesn’t cease to be cause just because it also has a cause.