> Early testers had Opus 5.5 coordinate parallel subagents on long audits and migrations, with little oversight.

This is their "Why it matters" for why asking opus to use subagents matters.

The fact that they think "some other people jumped off the bridge" is a reason to do something does not inspire confidence.

This has zero mention of the success or quality of those efforts. Just because they were done "with little oversight" doesn't mean it went well...