I find ABD's post interesting. It's all about playing a defensive role to his wife, protecting her from doctors and standing up for her rights, which is of course very important.
But all the talk of 'storming' around and 'demanding' things doesn't sound very conducive to a birth environment which should be more gentle and flowing.
I think this rather demonstrates how useful a doula can be (NOT to replace the father unless the couple opt for that) but to keep a calm atmosphere, a steady support and allow the woman to focus on labouring and the father to focus on being an emotional support. A doula can also reassure the husband that things are progressing normally.
Of course, men will generally leap to fighting for pain relief quicker than a midwife. Obviously they don't like to see their wife in pain. However this is not always the safest option for the mother or baby and also, might not be what the mother actually wants. (Not saying this is true in ABD's case, this is a generalisation).
There is certainly evidence that women have shorter labours with less perceived pain if they are supported by a doula, and a doula should be well versed in coping techniques which ideally reduce the need for pain medication.
Ideally, women should have much better, consistent support in labour from a calm, supportive midwife whether or not anyone else is present.
But whether or not this happens, it should be entirely up to the couple to decide whether the father should be present or whether to add a doula to the mix.