As events are broadcast on relays, it also means that on small timescales there is no consistent global state.

Imagine a series of events, that travel along different paths in a graph of nodes. They may arrive at their destinations at slightly different times.

This can cause issues for programs that contain assumptions about timing of events.

An idea I'm working out related to this and key management:

One bad scenario is that of an attacker who compromised a user key. They could broadcast a malicious key delegation/migration event to lock the true owner from their account. Even if there are security measures in place, it's possible for the attacker to convince a portion of the network to accept this new 'state', since there is no consistent global state to be the source of truth.