Does continuity really add anything to your life. As long as you're entertained, what does it matter.
Think about any TV show you watch. Would you want at least minimal continuity among the episodes (unless it's a true anthology show, such as The Twilight Zone), or would you want the writers/producers to just make <stuff> up any which way from week to week?
Not everyone gives a crap about some made up universe and whether it's always consistent.
Star Trek started as a cheesy TV show for younger people. Let's keep things in perspective here.
They threw in a few social issues. Big whoop. I will admit that I was sucked in, but then I turned 15.
If the producers have a choice between making big money or staying true to the Canon, guess what they choose.
I'll take a good plot with good characters. As long as I get those, I'm entertained. If you prefer bad plots and crappy characters as long as they stay true to some made up canon, good for you.
Wow.
Did some Star Trek fan kick your favorite relative/toy at some point in the past?
I'm curious about what you got interested in at age 15 that had better plots and characters, and when that was.
It is possible to enjoy Star Trek and have other SF/F interests. For instance, one of my favorite science fiction novels is
Cyteen, which qualifies as hard science fiction (ie. the emphasis is on not only the characters, but also the SCIENCE) and the reader actually has to concentrate on it to get everything that C.J. Cherryh put into it.
And on the other end of the spectrum, I'd still watch Star Wars if it came on TV. There's not a shred of science in it and Lucas shot his own continuity all to hell when he started tinkering with it (I'm fortunate enough to have a set of commercial VHS tapes of the first three movies (the middle trilogy) that were released before Lucas started messing everything up).
My own take about continuity is this: If you find it necessary to change it, make sure it's for a valid reason that's more than "just because." Otherwise, people like me will conclude that you don't respect the audience or even yourself if you can't be bothered to take more care with it.
For example: I got fed up after years of searching online, trying to find any Hulzein Saga fanfic. So I decided that if I wanted more stories (the original author is dead), I'd have to write them myself. And then I discovered that F.M. Busby went to a lot of trouble to figure out how relativity can make or break an interstellar economy and political situation, but he couldn't keep track of the career of one of his significant second-tier characters, and he couldn't seem to count ordinary years (some characters would need outlandishly long lifespans to accomplish everything he said they did, and there would need to be an extraordinarily advanced genetics lab in operation sometime in the 1940s to make the timeline fit - it would have worked better if he hadn't used some very specific dates).
I still like the books, but in order to make my own stories work, I have to retcon Busby's dates, decide which version of Cecil Bernardez' career is the real one, and figure out which first name a particular character has (Busby switched them around and mixed them up within the same book). Fortunately, I'm the only person I know of who even noticed his mistakes (he hadn't noticed a couple of them himself and evidently neither did his editors).
So this might seem like needless nitpicking to some people who don't think an author should respect their audience/readers. But at least I'm not arguing over the minutiae of what shade of whatever color the Enterprise nacelles are in any particular season of which particular show. I really couldn't care less about stuff like that.