Well, building generational wealth takes time. What exactly do we mean by generational wealth? We can only control the wealth that impacts our personal lives and families, not community-based.
It's not as easy as some make it out to be as you have to come from a functional background in terms of family and choice of career can make a huge difference but family especially. I say family because those who come from strong, structured families already have the tools and support laid out in front of them; in other words, wealth was already established from previous generations, y'know, a “head start,” and obviously, the type of career/job plays a role.
If you come from a family that is sadly dysfunctional and overall not as structured, especially financially speaking, then it's gonna be harder to obtain wealth and save it for future generations because the need to live a good life in the present takes precedence.
Somebody working a standard minimum wage and above average five-figure salaries doesn't have the means or time to be thinking about building generational wealth. Whereas someone who is cashing in a six, seven, or eight-figure annual earnings can generate their family's wealth in a shorter span.
I'd say most Black people are focused on the cards in front of them by just trying to live a good life, y'know a nice job, car, taking care of family and loved ones, establishing a happy home, relationships/marriage goals, etc.