My picks for "best TV of the last decade": Better Call Saul, Atlanta, High Maintenance, Maniac, Severance, Game of Thrones (S1-5 only), Undone, and The Expanse. Maybe an honourable mention to Black Mirror, Bojack Horseman, and Silicon Valley.
I have some others I'd personally rate up there, but which are probably more niche (not as widely appealing).
I have actually seen some of those, including two (Silicon Valley and Game of Thrones) to fruition. Those two are actually excellent examples of what I am talking about, and you even called it out by cutting off the later seasons of Game of Thrones.
The types of TV series that are not episodic seem to always devolve in this way towards worse quality and inter-character romantic relationships, not to mention having cliff hangers at the end of every episode. It's a tension and resolve tactic that gets pretty annoying.
Black Mirrors is just a bunch of unrelated short stories which aren't that great compared to a movie.
Bojack Horseman is pretty good indeed, but mostly because it's a comedy. The drama isn't very interesting.
I've heard that a character dies in every Game of Thrones episode, which means some characters will lack depth since they won't have the time required to develop it.
I have some others I'd personally rate up there, but which are probably more niche (not as widely appealing).