I can't help but think that a lot of it is to do with the collaborative writing process, with frequent fast rewriting. Films suffer the same. Shows with one writer or at least a very strong creative lead are usually much more coherent.
Television is being carried by production values at the moment. It looks and sounds great!
And yes, dialogue is written to sound cool because it's supposed to be entertaining. Most real-life conversations are not that engaging.
To be fair, that is something that definitely often happen in real life.
That aside, I find HBO or netflix series writing much better then the one in movies. The movies became too formulaic over time, relying on the same simplified character stereotypes over and over. The movie plots also tend to move in predictable streamlined ways. The film writing tend to follow stiffing rules.
Don't forget about the endless reboots. E.g. Batman in film:
1940s (before my time)
1987+ reboot with 4 movies
2005+ reboot with 3 movies
2021 apparently yet another reboot
I probably got some of that wrong, because there's just too many of them. And I probably missed some. And that doesn't include the "extended universe".
Sigh. Can't they find any other stories to tell?
I think the same applies to e.g. Spider Man? Countless reboots? Don't people get reboot fatigue? Or does enough time pass that the movies simply appeal to a new audience?
What shows do you watch? Otherwise it seems to me to be an uninteresting blanket statement, since there's tens of thousands of people working in TV.
Then there is a segment of the market that specializes in creating higher quality products for demanding consumers, and to command higher paychecks and respect for the actors and production brands involved. Sometimes people who care about fiction manage to sneak in here. But Hollywood has gotten increasingly good at replacing the director-auteur with schmaltzy schlock that still tickles the sensibilities of people who want to believe that hollywood is art.
For example: The problem with Game of Thrones' last few seasons was that they ran out source material from an author who cared about his fiction. TV and film don't know how to tell a story because they're designed not to. Maybe most of the individuals involved do, but the system doesn't. It's so bad that a resource-rich production shit the bed with a head of steam and plot points from a real author. They couldn't even convey "bad person is BAD" without falling back on Nazi imagery. Of course the conclusion was doomed.
Part of that is for brevity/interest sake I imagine
Why do people always oversell the equivalence of software and thing-that-is-not-software when trying to take lessons from the other thing?
They're both collaborative creative processes with scheduled product deliverables. That's where the similarity start and end.
If the author could admit the ways live action production is sharply divergent from software development and show how the translatable advice crosses the gap, then I might care what the rest of this article has to say.