This was actually a joke I didn’t make obvious enough - I largely agree with your point but from an opposite perspective: children’s lack of knowledge and experiences does make them incomplete, but the same applies to adults. There is always room for new growth and understanding towards the platonic ideal of completeness, and that means children’s thoughts and feelings are just as inherently valuable and worthy of respect as any adults. Neither has every perspective and understanding, but they both know how they feel better than anyone else.
You are completely right about respect and empathy though. I used to work with 5-11 year olds and volunteer with 11-18 year olds, and a lot of the time difficult children just needed someone to listen to them, particularly the neurodivergent ones. They know full well when you’re being patronising or not really listening, so talking to them in much the same way as you would an adult works wonders.