If BF does has health benefits (which I always understood it does) then some babies will be harmed by not having those benefits, by definition. For example, if BFing gives antibodies which protect against illness and FF doesn't, then there will be some babies who get sick who are FF, who wouldn't have done if they had been BF.
However there would be no way of knowing exactly who those babies are - you couldn't say - look, this particular FF baby is sick, and wouldn't have been if s/he was BF, because there's no way of knowing what the outcome would have been otherwise, there are too many other factors involved. But just because you can't easily identify which babies wouldn't have got sick if they'd been FF, doesn't mean that they don't exist. It is just one of many risk factors.
I'm not trying to have a go at FFing, honest. It's great that it exists, and it a great help fpr may people. But people seem to find it very difficult to get their heads round risk / health. Just because a baby looks fine, you have no idea whether something might be causing him / her health problems in the long term. You can't look into to a crystal ball and see what their health will be in thei 50s / 60s, but it was alway my understanding that early diet / nutrition (including in pregnancy) can affect your health later in life.
That's not to say we should live in hermetically sealed rooms! But just that to ignore that there are risks attached to things in life doesn't make them go away.
I live in a house full of stairs. I know that this is a risk to my little one. But I'm not saying everyone should live in bungalows! We still choose to live here - we have made the decision that the benefits outweigh the risks. That doesn't stop the stairs being risky though.
People choose to give their children FF for whatever reason (to keep them alive being a good one! Or make life bearable or whatever) but that doesn't mean that a - probably very small indeed - amount of them will have an adverse affect to their health as a result. To pretend otherwise is wilfully naive. Unless you think that BFing has absolutely no health benefits at all, but that is a different discussion altogether. and not one I have time to research right now.