Sry sollvac but you are incorrect, anytning that happened in the prime timeline may still unfold. We were not told any specifics of who has perished. Any and all characters from the "primeline" May still be around. Just because events unfold differently does not me similar outcomes are not possible. After all the primeline enterprise crew is now together.
And in any work of fictionthe writers are indeed "god."
Most of your agruements have lil to no merit. Q did introduce humans to the borg "early" as guinan even said that humana weren't suppose to be out that far that soon. Vulcans not in starfleet, um hello spock. Clones of clones of clones have mistakes, not the original clones themselves.
Also you "assume" alot with your time scenarios. If one goes back and kills speices 1, who is to say species 2 doesn;t simply take over and become the borg. And if there were no borg the undine whouldnot have game to our space, they came here to retaliate not conquer.
Star trek takes the point of veiw of a multiverse, where all outcomes happen. Which ones will happen in the univerese jj is creating who is to know. If you hate what jj has done thats all good and fine. But anything and everything is still possible in the abramsverse.