"In what way was the research "not fit for purpose", or rather which purpose didn't it fit?"
When I talk about the purpose of the research I'm not referring to the way it may eventually used by outside agencies. I'm referring to the brief that health researchers set themselves.
Much of the research into infant feeding done in the past 40 years, which compared outcomes for ff and bf babies, failed spectacularly to adjust for 'dose' or exclusivity. This is a massive problem, given what we now know about the health differences associated with partial and exclusive breastfeeding.
"Surely, the developers of formula's main research target will be to create formula which gets closest to breastmilk as possible."
You'd hope that wouldn't you?
"As for suggesting that mode of birth actually MATTERS to babies - that's your personal belief"
I think you'll find it's also the belief of most of the 1000's of midwives practising in the UK and around the world.
"although there's from what I can see not much sound scientific evidence around this, but a lot of philosophical theorising and romanticising"
Or we could turn it around and say there's no evidence that medical interventions in birth AREN'T associated with subtle disturbances in the mother/infant relationship. And that would be because it's almost impossible to design research which could adequately address this issue. Personally I start from the position that those arguing for wider use of surgical or medical intervention into natural processes like birth or breastfeeding are responsible for finding proof of the efficacy and harmlessness of the intervention. And absence of proof of harm is not proof of lack of harm. 
And sometimes the right questions aren't asked - this is particularly the case when research is driven by commercial interests.
One example - a recent study finding cognitive impairment in children fed iron-fortified formula in infancy. (see below). BTW - the study is a large, double blind RCT...... The research into the value of iron supplementation of infant formula didn't ask the question: do all children, even those with high iron levels, benefit equally from iron supplementation in infancy?
Makes you look at the Cow and Gate 'giant cup of milk' advert in a different light....
"Iron-Fortified vs Low-Iron Infant Formula: Developmental Outcome at 10 Years
This study enrolled 835 healthy, full-term infants in Santiago, Chile. From 6-12 months infants were fed iron-fortified (mean 12.7mg/L) or low-iron (mean 2.3mg/L) formula milk. At 10 years of age 473 (56.6%) of the children were assessed for IQ, spatial memory, arithmetic achievement, visual-motor integration, visual perception, and motor functioning.
Compared with the low-iron group, the iron fortified group scored lower on every 10 year outcome.
Betsy Lozoff, MD; Marcela Castillo, PhD; Katy M. Clark, MA; Julia B. Smith, EdD. Iron-Fortified vs Low-Iron Infant Formula: Developmental Outcome at 10 Years. Arch Pediatr Adolesc Med. Published online November 7, 2011. doi:10.1001/archpediatrics.2011.197"