I agree.
It sounds like you were well aware of the complications that might developing during parenting after being parented by a narcissist. I would love to say this is the norm but years in social work suggest otherwise. And yes, children have zero chance of changing their narcissistic parents and it can be heartbreaking to watch them try. Children, by virtue of their size, psychology and needs have very few enforceable boundaries.
There will always be complications that emerge in psychology regardless of who parented us - because, having learned the term 'neurodivergent' - I think it's basically meaningless, we are all neurodivergent from each other and making sense of our lives in a complicated world.
Good job on breaking the cycle and great job on protecting the urchling from the errors of previous generations. It is the best gift you can give a child. :o)
Apart from maybe a Thundertank circa 1989