"The transition from being a UP child to being an adult must be all the tougher for entering a world where you are no longer listened to, where your opinion no longer counts, where no-one rationialises all you do."
Rubbish.
You make it seem as if the child lives in this insulated bubble and then is suddenly kicked out at 18 into the hard cold world unprepared, never having met with indifference, scorn, counter opinions. Children growing up have met and dealt with a variety of people. Nice friends, bullies, good teachers and bad, indifferent grandparents and relatives, and keen ones, weird strangers and kind.
How on earth a solid relationship with a parent who listens, seeks consensus, mentors, doesn't place too many onerous conditions and works hard to understand the deep seated reasons behind certain behaviours as the child moves towards independence is destined to f*ck them up is a concept that is beyond me.
Strawman alert: Might as well ignore them in their crib, stick em in the garden, 'cos it's a hard, tough world out there, sweetie.
Going out into the adult world fully independent is always fraught. For any child, from any background. Some certainly find it easier than others for a thousand different reasons.
UP (or rather, the non reward/sanction based upbringing) is not about pandering
UP is not about endless negotiations about the colour of t-shirts or seat belts
UP is not about 'never letting the little darlings cwy'
UP is not about abandoning boundaries
UP is not condoning bad behaviour and writing it off as
UP is not about giving a child a bewildering array of choice
It is simply not using behaviourism as a parenting tool. It is closer to how many of you would parent than you think. I don't care whether it has a name. It does, but so what. I sure you can live with it.
It's just any explanation of it lays the poster open to ridicule and accusations of smuggery. I can't speak for others, but I am anything but smug.