Unusual Nature of Field Training

It's becoming increasingly clear to me that training arbitrary behaviors to dogs, such as the skills needed for agility, freestyle, rally, and obedience, is different from field training. For example:

• Side-effects from encounters with aversives, whether accidental or being used intentionally by the trainer, are less of an issue because the dog's joy in the sport is so strong that it dwarfs the price being paid to learn correct responses
• Management is more important because incorrect responses may be more reinforcing than any available extrinsic reinforcer for correct ones
• Some behaviors regress and require remedial training because the trained behavior is competing with natural alternatives that appeal to the dog's instincts even if they've never been practiced
• Trying to build performance skills purely sequentially postpones key motivational experiences too long, so the field trainer must expose the dog to experiences the dog isn't yet trained for
• Extrinsic reinforcement is reduced in usefulness while what I call "discovery training" — that is, training based on intrinsic reinforcement — becomes indispensable
• Behaviors that are fluent in close proximity are difficult to keep reliable at tens or hundreds of yards distance
• 2Q field trainers have no model to follow