Agents, besides tool use, also have memory, can plan work towards a goal, and can, through an iterative process (Reflect - Act), validate if they are on the right track.
If an agent takes a Topic A and goes down a rabbit hole all the way to Topic Z, you'll see that it won't be able to incorporate or backtrack back to Topic A without losing a lot of detail from the trek down to Topic Z. It's a serious limitation right now from the application development side of things, but I'm just reiterating what the article pointed out, which is that you need to work with fewer step workflows that isn't as ambitious as covering all things from A-Z.
Agents, besides tool use, also have memory, can plan work towards a goal, and can, through an iterative process (Reflect - Act), validate if they are on the right track.