Like there isn't a compromised solution from any other company. A7s = low-light wonder, contrast detect only, A7r = big megapixel, compressed raws, contrast detect only, A7II = phase detect, lower pixel pitch, not low-light wonder. Canon splitting a 5D lineup is exactly like Sony's lineup, so I don't get the assertion at all, especially in comparison to the other options out there.
It's nothing to do with the splitting of the lineup and everything to do which what features makes it into which model.
At the higher end, the lineup has to be split because people are doing specialised shooting with specialised tools - ISO and frame rate for action photography, resolution and DR for landscapes/architecture/stuff that doesn't move, different filters for astrophotography, etc. It's expected and not a problem.
The problem is when a camera designed for one thing does better in a something that's not key to its performance than another camera for which that area is key. It would be as if the A7II had better low-light performance than the A7s, or if the A7s had better DR or higher resolution than the A7r.
The entire A7 range isn't designed for fast AF anyway and all current Sonys have compressed RAW, so I wouldn't count any of those examples as this.
Using a Sony sensor.