I stopped watching a few years ago and this was a major factor. There's a lot of crap writing in television these days. Everything's been massively dumbed-down. There seems to be an assumption that the audience is a bit thick and we're probably on our phones anyway, so it's best to spoon feed us information.
Don't show something onscreen - make your characters say it out loud, just in case the viewer wasn't looking! Why show the house number for No. 26, when you could just have a character randomly announce that they live at No. 26?
Don't write a period drama and have people actually behave as they would have done in the past! Viewers will be too dumb to understand the historical context, you see, and might just hate your characters instead. And we can't have that. No, it's better to just make every character think and act like they stepped straight out of the modern day.
Oh, and ambiguity is death. Your audience should never be asked to grapple with difficult questions. Don't ever let them decide for themselves if Character A or Character B is in the right in an argument. No. Character C must always come along and tell you Character A was right. And then Character B must make a groveling apology, following the same script, to really hammer home the point.
It's all so painfully childish.