[enko]

Well, I agree, but the article doesn't even have the word "mix" in it, it's "juniors good, seniors bad or at least probably unnecessary".

[mindcrime]

I took it as implicit that they were advocating having at least some senior level people, as one of their bullet points was to "provide mentoring." If there aren't at least some senior people, who would be doing the mentoring?

It's a fair point, though, that TFA doesn't really go into detail about the exact composition of a team that they are suggesting.