In my experience, one reason this doesn't happen is because it's a lot easier for middle managers to carve out tasks and assign them then it is to corral and co

In my experience, one reason this doesn't happen is because it's a lot easier for middle managers to carve out tasks and assign them then it is to corral and coordinate a bunch of enthusiastic people trying to help. It's easier for them to take credit for the work done in the end as well.