They are actually helpful.
I know some adults who never became helpful.
Do you see yourself in your daughter at that age, or was it just different for us back then, without this level of digital manipulation?
but may think that they know so much more about it than they actually do and thus may not realise when they are falling for something that they've missed
For every one they catch, 20 techniques slip through their mesh. It is like a magicians trick, showing the "trick" to draw attention, whilst the real thing is happening out of sight.
Similar but different. We were still being relentlessly bombarded with and influenced by ads and the like, and as kids sibling dearest and I were definitely very susceptible to desperately neeeeeeeeeeding whatever cool looking thing that was interesting to us that we saw in whatever tv or magazine ad. Advantage of growing up on Christmas Island was that the advertising was very much restricted to tv and magazines and radio I think (if we were listening to the radio it was in the car and usually our radio station, I don't know when we got other ones). Possibly a different story when we went out on holidays to Singapore to visit extended family but all I recall of that was add suddenly desperately neeeeeeeding fast food all the time (probably at least somewhat related to the fact there wasn't any back home).