The power of focus. Before the crisis, each team worked on its own backlog and specialized in its domain. In the backlog, there were finely decomposed tasks, the team selected several tasks for a sprint. But during the crisis, we worked quite differently. The teams did not have specific tasks, they had a big challenging goal instead. For example, a mobile app and API must handle 300 orders per minute, no matter what. It is up to the team how to achieve the goal. The teams themselves formulate hypotheses, quickly check them in Production and throw away. And this is exactly what we wanted to continue doing. Teams do not want to be dumb coders, they want to solve problems.
The power of focus manifested itself in solving complex problems. For example, during the crisis, we created a set of performance tests in spite we had no expertise. We also made the logic of receiving an order asynchronous. We have long thought about it and talked, and it seemed to us that this is a very difficult and long task. But it turned out that the team is quite capable of doing it in 2 weeks, if it they are not distracted and completely focused on the problem.