When facing a potential adversary with trillions of defense $ at its disposal (and nuclear weapons). You have two options:

1. Security through Ubiquity   (So widely used in the world economy as to be important for its continued function.)

2. Security through Obscurity   (Small enough that state actors won't bother with it.)

The network is secured by warehouses full of gear burning MW's of electricity, their locations are known. Nodes publicly broadcast their IPs. PoW protects us from certain attackers, but not from state level actors.

We're going to stick with 1MB blocks and keep on rollin' with option 2.

Nakamoto's ideals were actually option 1, but we can thank Gregory Maxwell for demonstrating Satoshi was wrong and changing course back to 2.