PlayStation is easy. One, two, three, four. Not hard to tell the difference. Xbox is a bit stranger, but still easy to tell apart because against its numbered and we’re used to numbered things being different from each other.
But Microsoft is headed down a Wii U-like path with the Xbox One... even as a gamer (who admittedly doesn’t own an Xbox), I have no idea if the Xbox One S is newer than the Xbox One X or what the difference actually is, and it’s not intuitive that the Xbox One S is actually appreciably different than the Xbox One other than being smaller.
Sony may find themselves in a similar pickle if people stop buying PlayStation 4 games because they’re unsure if they work on their PlayStation 4 Pro Or vice versa.