The average company now runs thirteen agents, and each does about six things

This is vendor telemetry from a company that sells agents, so read the direction rather than the totals. The direction is still worth having, because it is the first sizeable picture of what an agent estate looks like inside a normal business, and the shape is a lot of small things rather than a few capable ones. Thirteen agents doing six actions each is not an autonomous workforce, it is a set of well-scoped automations with a language model on the front. That matters for how you plan, because the failure mode in most organisations is not building too few agents but building thirteen that nobody owns, and build time falling by half makes that easier to do by accident. The number worth tracking is not how many you have shipped but how many have a named owner and a way of telling you when they are wrong.