That's what's described in The Mythical Man Month at some lengths. No matter what the process, there's communication overhead that increases somewhat exponentia

That's what's described in The Mythical Man Month at some lengths. No matter what the process, there's communication overhead that increases somewhat exponentially with team size, which means you get diminishing returns from adding more devs at some point. A solo developer is in my experience always insanely productive compared to a team, as long as it's not a junior at least. But there's still a team size at which the larger team breaks even and can be more productive - plus you have a better bus factor. If you want to go fast, do it alone. If you want to go far, do it together. Unfortunately, I've seen a number of self proclaimed 10x programmers act completely uncollaborative to put themselves in the solo developer situation, outperforming teams of ~5. If management can't recognise what's happening there - they pay someone more than the others to effectively hurt the company.