A valid point and one that we tend to forget. There is much wrong with the BBC these days and they could (in my opinion) have done more with this series - but these programs were so much better than a lot of the awful stuff that passes for documentary and pollutes the airwaves these days.
I enjoyed all three programs. Yes, there was a lot of stuff I thought they missed out and, yes, they spent more time than was necessary on other stuff - I got the distinct impression that much of the content was dictated by budget; the cost of concert footage and interviewees and the savings to be had from reusing material where possible across all three programs. But it was a decent set of programs with some interesting material and a broad appeal that extended beyond those of us who play to include the wider listening public and for that I think the BBC should be given due credit.
Other opinions are, as always, available and valid....