I can only assume that your version of "creatively viable" and mine differ. TMP was a rehash of "The Changeling". TNG remade a TOS story as early as episode 2. They basically kept the same formula they started with in 1987 with TNG throughout all that, all of Voyager and seasons 1 and 2 of Enterprise. Forehead alien planet of the week, beam down, get into trouble, get out of trouble and go home - and none of it really mattered because everything was back to how it started by the episode's end.
I find that extremely reductive. "First Contact" from TNG looks nothing like "The Apple" in TOS. Yes, they are exploring planets that have other lifeforms like us on it. But there's a host of episodes, to be as equally reductive, where they have to learn to communicate with something that doesn't have a mouth and bumpy foreheads. They just aren't talked about like the Borg episodes.
Voyager, by the end of its run, had done nothing to further the Maquis, got rid of Kes, neutered Neelix, had become a host of guest star appearances (Jonathan Frakes, Marina Sirtis, John De lancie, and Dwight Schultz) from TNG (esp. Sirtis and Schultz), and every two-parter, most especially the series finale, included the Borg. It didn't stand on its own two feet. It tried for 2 seasons and then mailed it in as a continuation of TNG, a bad season of TNG.
That's bankrupt.
DS9, by the end of its run, had added layers to the Cardassians, Bajorans, Trills, and Klingons. They did whole character pieces about each of their characters and how they act in their society. They had a host of guest stars that were added during the run of the show, and only Marc Alamo had been a guest on TNG, although as a different character (but same race). The central themes were consistent throughout the show. They added the Dominion to the Star Trek vernacular. It was creative.
That's what I want. And they managed to be creative in adding familiar elements. They abandoned the type of guest appearances that ruined Voyager (Q-Less comes to mind).
I figured the definition might need an example.