a governance decision made at time T only takes effect at, e.g., T + 90 days. This allows users and applications that consider the decision unacceptable to move to another application (possibly a fork)

This is very interesting tbh. On paper, this would mean people have a chance to "flee" - during the Steem vs. Tron battle, I felt like Hodor holding up a giant door from the attackers, but as we all power down, the door was inevitably knocked down, and some of us got eaten.