I sort of agree that the surface area and incidental complexity of stacks give more space to plug more developers in than was true in the 70s and 80s. But I disagree strongly this invalidates Brooks Law. Certainly there are cases where adding people helps, especially if they are stronger engineers than the ones that are already there, but I’ve also seen way too many projects devolve into resourcing conversations when the real problem was over-complicated, poorly reasoned requirements, boil-the-ocean solutions promising a perfect end state without a clear plan to get there iteratively.

Plus, the "since there are more resources, let's add features" effect.