I've seen that before, it has some good points. I don't think an experienced person has to - or always does - get like I described. But it does happen.

The question was "why higher less senior people?" My answer, and perhaps I wasn't clear, was that for your first 1-5 devs, you should definitely higher senior...but once you break past that then your senior devs - you know the ones who launched all that boring technology - then want Jr devs to mold into doing things the right way from the start.