Very much agree, having kids has totally changed the way I work. I definitely have less time to do side projects and have to heavily coordinate with my wife when I want to work on a side project.
On the other hand I have had the experience that I am much more focused when I have the time as it has become more precious in a way. My motivation to create something new that could potentially benefit my children is also much higher. Just have to be careful not to convert motivation to self-pressure. It can be a thin line sometimes.