Yes, my comment is my own personal experience, and my conclusion based on that experience. What sounded dismissive to you was a slightly cynical take on the parenting advice industry, and contains my advice to stick to your own intuition.
Understandable, I was editing that part to soften it a bit before I even saw your reply.
6 year old is currently in that state. Again, even daring to admit something like that invites commentary from other parents how we did it wrong. Maybe so, but his mother is also a highly anxious person who could not handle letting a child be upset without comforting him. I also have a 12 year old who sleeps fine on her own now but was similar to about the same age.
So again, I don't see a way to be a parent other than intuition coupled with openmindedness, and that undoubtedly our own limitations or neuroses will end up affecting our children somehow (to the extent we don't or can't work on ourselves). It's somewhat of a tragic or at least deeply humbling experience.