Re: It was indeed very pretty.
I think it's dumbed down partly because of a culture of 'inclusiveness' which means getting rid of all the long words in case someone doesn't understand them because god forbid they might be challenged by something and go and look it up.
But it's also dumbed down because the BBC does lots of programs 'in association with' other companies. So there's one on Madagascar 'in association with' animal planet. The program is full of pictures of Madagascar and its wildlife, and very occasionally a snippet of information. The blind cave fish were mentioned - we were informed they were blind and occasionally swam upside down. Nothing on what they ate, how they bred, how they found their way around, or anything at all about them beyond 'HURRRrrrrr look at der wyrd fishies'.
There's also the ones done in association with the Discovery Channel, which feature beautiful pictures, soaring music, and just occasionally, when there's time, a snippet of information.