Which is somewhere between irrelevant and a good thing because of the way their products are sold. Namely, consumers search "power bank" on amazon and buy something in the top 5-10 results. The more positions on that list Anker can hold (by having slightly different products) the better position they're in.
There are a number of people who won't buy a micro USB cable unless the product has the name of their phone in the name. So you see the exact same product listed multiple times with different names.
If amazon would extend their car parts search functionality -- letting users put in their phone model and then giving a curated list of compatible devices, it would be awesome.
It works pretty well for car parts, although you're at the mercy of the seller to determine compatibility for less prominent things.