My theory on essential personnel:
First off, as a CP manager who actually was deployed last year, hats off to the technicians, ya'll do some real work.
The CEOs make a difference by setting priorities and policies I see (can work vo, can't work vo, how much to spend on development),
The directors know their corner of the business, usually one or a small cluster of related applications or segment, I had one who traveled around the world not on sales jaunts or some ostensible reason for meeting the workforce, but because he was seeking first-hand experience with our tools as they're experienced at most-of-world offices. He's be online in Hong Kong at 3 am pressing the gang back home on why this or that wasn't working acceptably.
But the levels in between director and CEO? They seem to come and go with a reorganization powerpoint every six months. My manager and I—a team for many years—spent 20 minutes a few weeks back trying to remember every AVP we ever had. In our case and most of our colleagues, we're not interchangeable. I could not take over peers' work and vice versa. It's deeply technical stuff that takes a year or more to even begin to master. But AVPs step in, step out, and none of it seems to make a whit of difference to our daily work.
At town halls from that level, I'll be horns-waggled if I can tell any differences other than the speaking voice and the choice of auditorium (or now, whose home office) they use for town halls. The topics are always the same: employee NPS is big. I'll mention it again, because they always do: NPS is big. They essentially repeat the CEO's priorities verbatim, but unable to answer any specifics, either because of NDA or more often, they just don't know. Then, six months later, Poof! and they're moving laterally to lord over a completely different group, and the same town hall happens with different faces and voices.
I suspect there's some available slack in those levels.