If you've not read Fred Brooks MMM, give it a shot.

It seems like you're implying that teams of 60-80 developers should be expected to outperform teams of 12. This is simply not true. The most important feature of source code as a language is that it allows precise mindshare among close knit teams. It doesn't guarantee it, but it makes it possible for people to talk about the product at a level that is otherwise very difficult.

A convenient side-effect of the source code is that it instructs the machine what to do. But instructing the machine was never the bottleneck, the essential difficulty of software development is in understanding what are the correct instructions to achieve some objective, not typing them out.

The problem is that communication doesn't scale at all. Having just 3 developers with good alignment about mental models, best practices, and design direction is hard enough, and if you found the right three people at the right time with the right ideas, you could generate billions of dollars of value.

Large monolithic teams on the order of 80 are a product of people in control not understanding how software development works, and how to make it work well.