The point you make about a balanced course is a very relevant one. Nobody wants any course to be a clone of the one they shot 2 weeks ago but it is right that the course should be built to a specification, entertaining, challenging, inspiring, and more to the point achievable.
Without mentioning any names, we've had some instances not long ago in the SWEFTA league where criminally hard courses were put out, and it put a lot of people out too. If you have an agreed set of rules then the players will know roughly what to expect, and that's fine.
Our home ground is quite open and exposed; we keep to the design rules and ring the changes with target height above ground for example, and we usually have the longer target first in each lane but sometimes will work a flanker to catch the unwary.