The iPad lineup in particular has gotten pretty bad. There's the iPad Pro 12.9-inch, the iPad Pro 9.7-inch, the iPad Air 2 (which also has a 9.7-inch display), the iPad mini 2 and the iPad mini 4.

Why would I get a 9.7-inch iPad Pro over a 9.7-inch iPad Air 2? What's the difference between an iPad mini 2 and an iPad mini 4, and what happened to the iPad mini 3?

They ought to just have three iPad models, distinguished by size: iPad Pro (the 12.9-inch model), iPad Air (the 9.7-inch model) and iPad mini (the 7.9-inch model). That would make it much easier to tell the difference and decide which one you want.