All this talk though just goes to show that Trek as a whole is probably the worst Franchise in scifi history when it comes to overall continuity consistency.
Oh, hardly. By 1960s-70s standards, it was better than most. At the time, we didn't have home video and box sets and wikis to let us experience series as unified wholes, and without VCRs and with broadcast interference from storms and breakable rooftop TV antennas, there was no guarantee you'd get to see every episode. So the focus was on making each individual episode stand alone without dependence on anything else. Also, the classy TV shows in early TV were the anthologies, while serialization was seen as the stuff of cheesy soap operas and kids' adventure series. So even dramas with continuing casts aspired to be anthology-like. And that meant they paid little attention to overall continuity and didn't hesitate to change things for the sake of the current story.
This persisted into the 1980s. In the pilot movie of the 1989
Alien Nation series, the big secret that drove the whole story and was revealed in the climax was that the alien refugees who'd crashed on Earth had been ruled by Overseers whose existence they'd forgotten because they'd been kept drugged and docile aboard the slave ship. But as the show's single season went on, it was retconned that the slaves had been fully aware of the Overseers aboard the ship, and the American authorities had known about them all along but hadn't been able to prosecute them for crimes not committed on Earth. Yet in the revival movies a few years later (which also altered the show's chronology), it was revealed that many Overseers
had been tried for war crimes and channeled into an Operation Paperclip-like program to provide alien technology to the military. I could list other major continuity changes, all in one season and five revival movies.
The finale of the original
Battlestar Galactica had the fleet pick up a transmission of Neil Armstrong landing on the Moon while it was supposedly on the edge of our galaxy, which would mean it was at least several centuries to a millennium in the future, but
Galactica 1980 retconned it so that the fleet reached Earth in, guess what, 1980, which would've put the previous series in roughly the 1950s. Similarly,
Buck Rogers retconned the date of the 20th-century nuclear war in its second season, and its first season promptly abandoned the pilot's portrayal of a mostly barren post-apocalyptic Earth with a single remaining city dependent on alien handouts for survival and replaced it with a prosperous Earth at the head of a Federation-like interstellar alliance.
So no,
Star Trek is nowhere near the most inconsistent SF franchise. I mean, don't even get me started on
Doctor Who.