@westy81585 You can disagree all you want. But you’re still wrong. :-P How can “original/regular cannon not change”, if the Spock from the original timeline no longer exists in the original universe/timeline?
If you actually watch all the various timeline/universe stories, it’s very obvious, and not at all ambiguous. There are two different kinds of these shows/movies. The “alternate timeline” and the “parallel universe” stories.
The Parallel Universe stories follow the theory that “whatever can happen, does happen.” Every time there’s a choice to be made, a new separate universe is created, so that both options are taken, in different universes. That’s what and Parallels, Mirror, Mirror, and all of MM‘s DS9 sequels are. Two different universes that exist independent of each other, with characters crossing back and forth. Both (or all) universes continue to exist, and the challenge is for our characters to find their way back to the universe from which they come.
The Alternate Timeline stories have someone travel through time, thus affecting the timeline and changing history. In Yesterday’s Enterprise, the Enterprise-C travels forward, disappearing from its own time period, thus changing the history of the Enterprise-D crew. In City on the Edge of Forever, McCoy travels back in time and saves Edith Keeler, thus changing all of history so that the Federation never even existed. In Past Tense, Sisko, Bashir, and Dax travel back in time and get involved in the Bell Riots, thus changing all of the history of Kira, Odo, etc. In all of these Alternate Timeline stories, we are talking about one timeline/universe, that has its history changed. In most cases, something happens that restores the original timeline, by going back to the point of the change and preventing that change (Enterprise-C goes back to when it left, Kirk stops McCoy from saving Edith, Sisko completes Bell’s roll in the Riots, etc). But not always. The timeline remains altered, in small ways, in some cases: alternate-Tasha appears in the past and mates with a Romulan to produce Sela, Sisko takes the place of Gabriel Bell in the history books, etc.
All of these stories have something in common – if they’re traveling through time, it’s an Alternate Timeline story. If they’re just crossing universes at the same time period, it’s a Parallel Universe story. Star Trek, by the fact that Spock & Nero traveled back in time and changed history, is an Alternate Timeline story.
There you go. I’ve made my case. You can continue to say “I disagree”, but it doesn’t change the fact that you’re “opinion” isn’t correct. If you do choose to continue to disagree, please at least provide something to back up your opinion, as I have done here.