How realistic it is isn't a major factor for me. It's simply a mechanic to enforce ARC/BRD to play more mindful of it's position and range in battles. By doing that, they also happen to solve the unrealistic aspect of shooting arrows point blank without being overly restrictive.

I expect ARC will be even more focused on placing specific crowd control debuffs on targets by using combos than it is now, which will have good synergy with the BRD job effectively specializing the class/job as support. Don't expect to see ARC/BRD putting out great DPS in ARR compared to MNK or DRG.