Yeah, I feel it's gone downhill in the last 5 years.
Similarly with American TV which overall wasn't as reliably good, but for a few years there were some very good things produced.
Style over substance is part of it for sure. In the end it seems to come down to the writing.
I feel like there are a lot of lines writers need to toe. People will complain about stuff being woke or tokenistic, but I think that's a particular manifestation of a larger problem. It's like stories need to all include certain tropes, or can't really challenge certain tropes.
I find for example that even dramas are often deeply anachronistic, particularly around social attitudes and norms. Even where they are lighter shows that aren't meant to be challenging it's difficult to take them seriously because it's obviously a total fantasy. Call the Midwife now, while it used to be good on these things, is almost unwatchable it's so full of anachronisms.
I watched an older show the other day, The Cazaletts. Not a perfect show but what struck me was that so many of the characters had both very good and very unlikable qualities, or were in some ways quite awful people while also having done good things, and there really wasn't much direct commentary about this that you could pick up from the writing - the viewer was really left to make judgement. The writing was pretty solid in terms of characterizations, even if I might have quibbled with the plotting.
A lot of it seems to be about creating a cool scenario, a cool visual image, or a cool character. (Killing Eve suffers from this.)