> There's the kind that, when given a problem, will jump in, learn what they need to learn to solve the parts they don't fully understand yet, deliver meaningful iterative results, talk to people as needed, keep you posted on their progress, loop in other team members and offer/request help to/from them, take initiative on the obvious missing parts that would benefit the project as a whole, etc

You're framing this person as a good developer, and sure. Probably some people who behave like this are good. MANY people who are like this leave mountains of problems in their wake. It takes a very special person to be able to build good quality with this kind of approach.

You're basically taking about someone getting the right answer on the fly at full speed

It's much more likely to get a subtly wrong answer, which is then dropped on that second group to manage and maintain going forward, while the fast moving person is hurried along to go drop a subtly wrong solution on another project with another team. This has happened to me many times in my career