Absolutely agree. Never a bad thing to gather more tools along the way, though. This is what I love about sharing in this group.
some tools and skills work might work well for one child and not another
This right here is so true and yet it can also cause that dreaded belief in favouritism between siblings. Each of our children can be so different. I always used to say of and to my girls that I loved them both dearly and equally, but they were different people, so they required different things. At nearly 20, my eldest finally realises what I meant. She'd envy the way I worked with her sister, purely because my approach was different, despite the fact that she always required more attention. She acknowledged to me the other day that those approaches weren't what she needed and wouldn't have worked for her.