Jordan,
The premise of your question seems to imply that architects design for par to begin with. Sure, we have conceptual holes that are Par 3, 4, 5, 6... etc. However, it really is more of a "Tee Shot, approach, interesting putt/chip" game in lieu of an actual number.
The architect should seek to provide interest in the individual shots on the hole, then par will take care of itself - relevant or not.
If we consider the holes to be "short, medium and long" how does thsi design process change? I'd imagine not too much, since it has been my experience that the architects use the "feel of the land" to determine the placement of the various sized holes.
Par enters into the equation after this initial design, ideally.
As such, does defending par (based on my arbitrary definition) fall more into the hands of the architect or the superintendent preparing the course for play?