cyberseraphim, you say "There is always a danger that a parent will choose a parenting method that appeals to the parental mindset or that is fashionable in their peer group - and this can be the case for routine based or non routine based theories."
Absolutely - which is why the best 'method' is to enable parents to parent responsively and to enhance and enable their own 'good' parenting skills, getting over any bad experiences they might have had themselves. When they are enabled to do this, their babies will respond - as you say, they are 'programmed' to love their parents and to attach to them, and will work very hard to make themselves loved, given the chance!
Repeated ignoring of these loving overtures and expressions of need will make the baby switch this off - the baby protects himself from rejection, in favour of physical survival. This is easy to see in extreme cases of neglect or cruelty (like the locking in a cellar example you give), but not so easy to see in more subtle situations, and may not even be apparent in childhood. It may only emerge in adulthood, in agression, mental illness, depression and anxiety, obsessions, mild personality disorders - and in their own attitude to their own kids.
I am not equating a GF regime to any of this - in practice, most parents don't adhere to it, anyway, or at least not to the extent of ignoring their children's 'non-routine' needs.
I am talking about any 'method' (written in a book, passed on from granny, copied from the TV, pulled out from the parent's own beliefs, wherever) that does not support (or worse, sabotages) the parent and the baby's developing relationship.
That's why I dislike any 'how to' book of childcare that purports to be a one-size fits all. Buy a book that tells you how to wash matinee jackets, by all means, or gives you hints on safety, but not one that tells you stuff about when and how to respond to your baby. That happens, when you are supported to be your unique, loving, mothering self, and which allows space for your baby to be the same.