Senior Leader's Involvement in the Army National Guard

In my career thus far, albeit relatively fledgling, I've yet to see much or any involvement of the Army Cheif of Staff, or the Sergeant Major of the Army within Army National Guard units. I have great respect for those leaders & their positions and could see the benefits to the total force with involvement in units / component outside of what their careers dirived from.

I'd love some insights.

First, is this true, they really don't invest a much interest in the Army National Guard units?

Second, if this is true, then why? Perhaps politically charged tension between the NGB, and DOA?

Or perhaps a lack of respect due to a negative perception, possibly leading to prejudice.

Any commentary is welcome, like I said I'm just looking for insights and opinions.