Focus: assign multiple engineers to the same task
Have you ever noticed that Jira (and most if not all) SWE work tracking systems allow assigning only one person to a given task? The whole industry (at least where I've seen it) runs around the assumption that at the bottom “one task == one person”.
The more I think about it through the years, the more confident I am that it's a very unproductive thing to do, and we should default to two people working at the same time on a given task. In complex domains, sometimes potentially even three.