Can you expand? What is the frontier of capability doing now?
Multiple studies have come out recently that AI use when not used as a tutor leads to loss of learning. It's a great way to ensure you end up jobless in the future when you forget even very basic syntax from no longer having to deal with hard problems. It's why pilots still fly manually by hand even though the autopilot can do practically everything.
Being charitable, perhaps they're mostly focused on efficiency, not overall capability. I can see that using swarms probably rarely results in solutions you couldn't reach with a single agent, at much higher cost. I think the tradeoff is that you get to the solution with less clock time though.
That said, the article text they quoted isn't even about swarms, it's just about the mental fatigue of juggling multiple single-agent threads. And there I agree with the article. I keep doing it because of agent speed, maybe I should just bite the bullet and get some $500 subs so I can use Astra ultrafast for everything. Only half joking...