While that is a valid concern, I'd argue that it is the case already. You play through one route and revelations for the other paths are spoiled since you can only be on one path at a time. It gets more apparent the more updates there are and once the game is finished, this would be the case.We should be good for the story to go ahead in the next releases now that the two maintenance updates out of the way. I prefer all the paths to advance at the same pace because there are quite a few revelations ahead that will at least in part be spoiled if one route is finished first.
At least with one path complete, you'd have to wait for the next update for the next path. By the time the next path rolls around, you'd probably forget a chunk of the previous path.
It does pose a very big problem though in terms of writing. If Nosy decides he wants to change something in the story while working on the other path, he may need to rework the previous path and that could be a headache that I would not even want to think of.