Senior leadership has many important functions, and more demands on their time than hours in the day, but their number one job is communicating a vision to the org. There's basically nothing else with similarly high impact as this is what blocks or unblocks the productivity of the entire organization.

I've watched 1,000 person orgs rot because the senior leader could not settle on a vision. He was "always on", smart, articulate, all those good adjectives. None of it mattered without the vision.