Have you seen the TMP Klingons?.
TMP was quite something when it debuted. It brought a level detail to the Trek universe we had never seen before. A lot of it was very cool and some of it left us wondering.
In TOS we had seen the modification/expansion of sets, such as Main Engineering and Sickbay, and we learned to accept it was really supposed to be like that from the beginning. Or we rationalized we simply were seeing parts of the ship we had not seen before.
In TMP we were told the new
Enterprise was a drastic refit of the original, so it was still acknowledged that the TOS
E was still part of this more detailed continuity. To that end fans rationalized that maybe we didn’t get to see all the detail the original ship had (ain’t that the truth given how much has been learned about the original over the past fifty years).
Even so accepting the TMP
E as a refit could be a head scratcher because the refit looks more like the original had been near completely disassembled before being put back together in its new form—what the hell was left of the original? Initially Matt Jefferies updated his original design for Phase II. But later when it was decided there would be a feature film they revised/updated the design. Note that early on there had been the idea of having a totally new ship, with a new registration number, but then they elected to go with the idea of the original ship being refit. Nonetheless we kind of turn a blind eye to it and accept it as explained.
The new uniforms are a point of debate, but they’re pretty easy to accept as an evolutionary change in Starfleet’s look.
The new Klingons raised all kinds of questions. More than anything else how could you rationalize how different they looked from TOS? This was something you couldn’t really just gloss over. The only reasonable explanation was that just as there are variations in human appearance then there must be great variations in Klingon appearance. And early novels kinda went with that.
One key point is that TMP, beyond its visuals, did not blatantly contradict TOS’ continuity. And,
for the most part, the subsequent five films didn’t greatly contradict the original continuity either (although there is room for debate).
The advent of TNG is we started seeing greater drifts in continuity. The distinction between World War III and the Eugenics Wars being a prime example whereas in TOS they were considered the same thing. But a real firestorm around continuity was ignited when ENT was introduced along with the TNG film FC.
Lots of argument about continuity.
So it’s certainly not a new issue, but over time it gets increasingly tiresome to be told what you thought was true isn’t really true, over and over again. Eventually you have enough.