Single threaded ownership cuts through bureaucracy.

The single owner can counteract the dulling consensus forces of the bureaucracy.

But be careful; that single owner can make a massive mess.

If you swarm the single-owners intentionally, checking ambition with ambition, you can get the best of the swarm innovating (resilience, adaptability) without the downside of empowering the most active person to dominate everyone else.

But the downside is you get a chaotic jumble!