But bloss, someone who has cared for 300 babies can't have cared for any of them for very long!! Maternity nurses typically care for babies up to about six weeks (often a good deal less) - this is simply not long enough to see the long-term results of any regime.
I am absolutely fine about someone with this experience sharing hints about laundry and the best sort of mattress and giving tips about how to hold a new baby safely, and bath them, and helping the toddler get used to the new arrival - after 300 babies you'd pick up a lot of practical stuff like this and certainly more than any paediatrician :)
But as for the other stuff, specifically breastfeeding physiology, there is a ton of research done (cumulatively) on many thousands of babies that no one could possibly hope to compete with in their own personal experience. None of the books give any hint that this has been anything other than skimmed over, and what little has been read has been comprehensively misunderstood (just read what the books say about foremilk and hindmilk, for example).
I think what I am saying is that if you want to write something that purports to fit the lives of 'all' babies - and to repeat, that's where the real weakness of the books lie, in this persistent claim that 'one size fits all' - you have an obligation to make sure your advice is soundly evidence-based. Even then, you have to be quite brave to claim the advice is suitable for everyone....
If an author doesn't want to do the reading and the research, then don't you think it's best for them to say nothing at all about the stuff they don't understand, and instead stick to practical and useful tips about woollies and decorating the nursery?