"Parallels" was basically a one-off in that sense.
Time travel in Star Trek has mostly always based itself on a single timeline which can be changed and unchanged through time travel. Stop acting as if all of Trek is based off the reboot, its beyond grating.
Key word: Mostly.
I simply took some of the other ways Trek has used time travel (which, as I said, predate the reboot by a decade) and suggested it to reconcile the Borg having time travel technology with the Borg seemingly severely underusing their time travel technology.
Get over me. And get over the fact that Trek offers more possibilities than just the ones in the episodes and movies YOU think should count.