Seemingly odd behaviors by both Canon and Nikon often (seems to me) can be traced back not to:
1. What real, living breathing customers want
2. What is likely to sell
3. What makes sense in context of an existing lens system
1. What is the other company doing and how can the one ensure they aren't "one Upgraded" by the other.
The pricing on the Nikon 70-200mm f4 is a classic example...way, way too high. But don't get me started on the family of existing DX lenses and the lack of wide angle primes at any aperture.