It might seem obvious if you don't think about it much, but one is a pragmatic breakdown from experience and one just says "adding cpus won't work forever if there is some part where you can't add more cpus".
One is basically 1 + 1 = 2 and the other is a warning of a non obvious situation that comes from lots of experience and effort.
It's not a parallel at all, the two things have nothing to do with each other. One means nothing and gives no new information, the other is about the complexity of getting familiar with software for people which is why adding more people doesn't help despite being unintuitive.
One is is good information from lots of experience, one is "the parts that don't use more cpus don't speed up with more cpus".
Unhelpful nonsense about running software vs battle won experience about making software.
