I definitely don't have as strong of feelings about this as others do. I tend to think about these in terms of in-game mechanics (biomes, terrain, continents of plants that can be used), as well as DLC possibilities that it leaves open.
I also think it's okay that in a game that is not going to have 40 official wolf subspecies, that they may want to have one animal that represents the species generally, or even a large collection of sub-species that are commonly thought of together, and then get more specific if/when they add on dlc animals that have a distinct look biome, etc.
Indeed, it might even be that leaving the inconsistency and vagueness might work in our favor, as opposed to trying to nail down the answer right now. If Frontier is remaining open to how long the official DLC support might extend -- if they haven't decided definitively that there definitely will or absolutely will not be a Eurasian wolf in the future, for example -- then leaving things as is allows for the most flexibility.