Personnally, I would not be speaking about Apple hardware, I don't know it well enough. But in general, hardware is relevant to security, simply because most of them nowadays contain firmwares. In some cases, that firmware can even be a small embedded OS. If that particular piece of software happens to deal with inbound data (think WiFi controller), then you have a potential security hole _which you have no control on_.
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Personnally, I would not be speaking about Apple hardware, I don't know it well enough. But in general, hardware is relevant to security, simply because most of them nowadays contain firmwares. In some cases, that firmware can even be a small embedded OS. If that particular piece of software happens to deal with inbound data (think WiFi controller), then you have a potential security hole _which you have no control on_.