I do think that Dr Who is as interesting lens to view cultural developments. In the 60s and 70s it strip-mined Hammer's horror, B-movie science fiction and pulp fiction for themes to plug into it's endlessly flexible format. Science fiction as a rule was psychologically flat, with most of its conceptual themes coming from ideas like ethical use of technology, depletion of natural resources, clash of civilizations, ethics of war, etc. Dr Who incorporated those themes, usually in a simplified and less nuanced way and was likewise psychologically uncomplicated - the Doctor was eccentric and enigmatic, the side-kick was spunky. On occasion science fiction plot themes would stray into the realm of what we would now consider woke, exploring concepts of sex, race, freedom, societal roles, environmentalism, factionalism, oppression and colonialism. Those ideas were explored in a sophisticated way by the great writers like Heinlein, Clark, Le Guin and Asomov. Those themes found their way into Dr Who too, though usually in a muted form. Some examples of episodes with broader themes:
- In Genesis of the Daleks, did the Doctor have the right to commit genocide against the Daleks?
- In the Sun Maker, the ills of degenerate totalitarian state that evolved from monopolistic capitalism.
- In Robot a mishmash of themes, how to limit AI sentience, atheism, scientist playing God. With an ally who turns out to be the chief antagonist - the brainy Miss Winters - the electrifying and spark throwing director of the National Institute for Advanced Scientific Research - both a veiled lesbian trope and formidable adversary of the Doctor whose own motives are intellectually justified, but corrupted by her lust for power.
In most cases, larger themes have a bit of a tacked-on feel, used to justify the action and to assure the viewer that you're rooting for the good guys. In Genesis of the Daleks it leaves the resolution of the serial suspended and elevates it to a masterpiece of the era.
When Davies revived the show in the 2000s, he turned up the tempo, modernized the SF/fantasy references and injected a large dose glossy, up-to-date, interpersonal melodrama. The result of the collision of genres - 70s-style Doctor Who and Buffy the Vampire Slayer - was a spectacularly brilliant success. But, detectable was another thread, the woke morality play. This too worked extremely effectively because it was new -- instead of being tacked on, the social theme was central to the plot, e.g. Harriet Jones' downfall for turning out being a naughty Thatcher clone.
Adding color to the 2000s era was the feeling that Davies was being subversive. Hot-off Queer as Folk he injected a heavy dose of sex, sexuality, and double entendre. This worked, even though in retrospect it was rather formulaic and not very subtle, because it was new and still risque.
Now practically all the tropes that made Davies' early 2000s novel, are not only cliched but required by sensitivity engineers. Watching an episode is an exercise in figuring out, not how the Doctor will save the day, but how the plot can be resolved without offending any sacred cows and still be slotted into one of accepted morality play formulas. I find it ghastly and unwatchable. I'm not alone. But I think the observation that's missing is that Davies himself has not changed from his former glorious self, in some ways he's become self-derivative, but in other ways he's a better showrunner. Davies was a genuine TV pioneer - the changes he helped introduce have become codified, and with it what's demanded from BBC light fiction programming and global distribution partners and its endemic of everything produced.