Very good piece, I agree with all the advices in there. That being said, it's often difficult to apply. This is because it requires quite a lot of self-awareness from teams and not everyone is willing to work on themselves to realize their weaknesses in the first place.

Also I'd stress one point which I don't find pushed enough in that article. Very often you want persons who might not make your team stronger now but will over time. This even works better in my experience. Hiring is a bit like gardening in a way: it's also about keeping in mind how the people joining the team will bloom in that particular context and how it'll improve the landscape.