I can understand your position, but I am afraid I have to disagree, respectfully. First of all,
BTS details provide for the idea of alternate reality being the writers intent from the beginning.
Not necessarily. I didn't spot anything that indicated they
always intended that outcome. Did you? Never-the-less, thank you for that link. Very interesting.
Wasn't a SG1 movie all about restoring the 'timeline' back to the way it was supposed to be? Maybe I didn't get the point of that movie then. I thought the team were all about convincing the President tolet them chane things so that the enemy (can't remember their name) didn't prevail and the SG1 team members didn't have dorky lives
Yes, but as
Mutoid pointed out, that's not the traditional "default" method (so people can be forgiven for jumping to a traditional conclusion). Even so, I don't think past Trek excursions involved the branching scenario. Without that you have to explain how time travel also gets you into a pre-existing alternate universe, not to mention why that universe is so similar to the one you just left. Even Bob said:
Now, we can split hairs over the methodology, but it seems that depending on the method of time travel will affect the arrival point in the time streams, either in the same time stream, such as Voyage Home, or Guardian of Forever, or an alternate reality, jumping the streams due to a spatial anomaly, such as an ion storm (Mirror Universe), red matter black hole (Abramsverse).
There is a variety of interpretations, they can fit in to the Trek verse with little problem
Sorry but that's not my impression. Once you invoke Quantum Mechanics, branching will occur every time you time-travel as its a part the fabric of the universe(s) not part of the method of time travel. Indeed if I understand things correctly, its happening all the time irrespective of whether time travel is happening or not. Its just that time travel is likely to product significant and interesting branches so we follow them. Eg. in the Mirror Universe example, arriving would have created a branch (in the mirror universe) as would trying to return to their original universe. Interestingly the bad versions of Kirk and Co wouldn't have shown up in the "Prime" universe either but would have created their own branch off it. This means the universe they got back to (not their original one of course but a copy of it) wouldn't know anything about their evil twins.
Disclaimer: I understand there is a book called "Department of Temporal Investigations: Watching the Clock" by Christopher L Bennet that goes into these issues. Now it may explain why the above is wrong in whole or in part. Unfortunately I haven't read it (yet) so I don't know.
Well, I am unsure of what the traditional "time travel rules" are, so I am open to multiple interpretations, or multiple possibilities. Either quantum realities, or traveling along the stream. Again, both are present in TOS, so it really does not bother me either way.
Maybe I'm spoiled by Stargate and their dealing with quantum realities, or maybe that time travel is something that bores me as little more than a plot device to create the story. Regardless, all the stuff I have read, and several previous Trek stories support the idea of quantum realities, and that Nero's incursion created a new diverging point in history, leaving other realities intact.
That, however, is my understanding. Quite honestly, for me, it is a window dressing, and changes occur due to a variety of factors. Personally, I have no problems with Starfleet being very, very different after being attacked by a giant Romulan ship, coming shortly after a war with the Romulans. Things are different because the emphasis by Starfleet was different from one reality to another.
I get that nuTrek is not for everyone, but it does not undo all the rest of Trek by its existence, any more than the Mirror universe undid prime universe.