But that was the problem. ENT, stylistically, structurally, and writing-wise, really wasn't all that different from Voyager which came before it.
I have no problems with changing preconceptions, but for the first two years the show was simply about a crew on a ship visiting planets/aliens-of-the-week. They even had a Seven-of-Nine clone. Every script for the first two seasons could have easily been written for Voyager.
I don't agree. Granted, UPN put pressure on the producers to make a show that was similar to
Voyager, against the producers' wishes. (Berman and Braga wanted the whole first season to be like "First Flight," a
Right Stuff-style narrative gradually building toward the start of the mission.) But despite that, I feel that ENT season 1 did a great job conveying a sense that these were pioneers doing everything for the first time, just beginning to feel their way as deep-space explorers and figure it out as they went. The VGR crew were out of their depth because they were in new territory, but they were seasoned veterans at space exploration in general, so it didn't capture that pioneer flavor quite as well.
Also, the astropolitical situation was relatively reversed. Even though
Voyager was on its own, it was generally more advanced than the cultures around it, aside from a few isolated exceptions. It was traveling through a lawless region of the galaxy where its technology was coveted (at least in the early seasons). It was more a traditional American/European "frontier narrative" formula where the peoples on the frontier are backward or savage compared to the protagonists expanding into it. (The Borg were certainly advanced, but they were basically space zombies rather than a civilization per se, so they fit into the traditional "frontier savage" trope.)
But NX-01 was a vessel of a nascent starfaring people expanding into a space already dominated by more advanced and powerful states, and having to deal with the realpolitik that it faced there. It was a more modern, post-colonial approach to the frontier narrative, giving more agency to the nations that already occupied the so-called "frontier." And thus it was an interesting deconstruction of
Star Trek's longstanding human-centrism and implicit America-centrism.
Except the original series and movie Enterprise zipped around the galaxy like it was nothing (rim of the galaxy, centre of the galaxy, 1000 light years in 12 hours at warp 8.4 in "By Any Other Name"etc), whereas in Voyager's world, Starfleet's fastest ship travelling at maximum speeds (given as warp 9.975 in "Caretaker") would take 75 years to cross the Milky Way. It's an enormous fundamental change which breaks the universe and means that much of TOS couldn't possibly have happened going by Voyager's speeds, or that Janeway ludicrously thought a month-long journey would take a lifetime.
It doesn't "break" the universe, because the universe is just a story being told, and stories are mutable. It just revises the narrative. Storytellers should be allowed to fix past mistakes.
One of the pieces of advice given to writers in the TOS series bible was that they should not treat deep space as a local neighborhood -- that interstellar travel should be depicted as something that takes a lot of time and effort. Those occasional episodes and movies that depicted travel over such great distances as quick and easy were in contrast to what Roddenberry wanted. After all, this was a narrative whose creators were making it up as they went, discovering the rules gradually and making mistakes. And there aren't a lot of television or movie writers who have any real grasp of the immensity of the galaxy. So occasionally some unrealistic depictions slipped through. By TNG and its successors, the show had technical advisors on staff who laid down a firmer set of ground rules for how the universe worked, a refinement and formalization of principles that had been applied in a more slapdash manner in the past.
As a writer myself, I am very bothered by the attitude some fans have that every last detail in a series, even the mistakes and bad ideas, needs to be slavishly obeyed, that writers should be forbidden to correct their past mistakes or try to improve their worldbuilding. That's a terrible attitude. Sure, fixing past mistakes in an ongoing series creates continuity problems, but that's because you don't get to go back and revise what's already been released (except on occasion when you do, like in revised novel reissues, directors' cuts of movies, etc.). But it's better than being perpetually bound by those mistakes and bad ideas.