I just took a flight path from Darkshire to Southsore and the gryphon flew erratically in Wetlands (went through the keep twice) and also went through the mountain, while going for the Hinterlands flight master.
So, try to identify and fix real bugs in the game before trying to make it more “inclusive” by “excluding” inconsequential and irrelevant stuff, if you still have enough people with the knowledge of how to do it.