Hmmm, seems to be a parallel "underground" story here… Yes,things have changed over the decades, and some are for the better, when it comes to social attitudes.
I have no TV so have not seen any of this series, but it must be hard for the makers of such to strike a balance between pleasing the two versions of interested viewer: one who knows which end of a spanner to hold, and the one who doesn't. This ability to know the audience could be one reason why the Open University programmes attracted a sizeable general audience of non-students: you knew the episode might be beyond your existing knowledge of the subject in which you had a general lay interest, but at least you were challenged, not patronised.
When living with my parents, who did have a telly (eventually), Horizon was among the few programmes I would watch. Over the years that deteriorated in a miasma of close-ups of faces telling us about what their owners were supposed to be showing us, and stock videos of blurred close-ups of fingers bashing computer keys.