People don't ask questions for ages and then I stop looking and look what happens.
I thank Donald for his explanation. A good one.
Having some eye is an asset. it brings useful balance to dogs that makes them easy to train. Bereft of the balance, the eye, dogs must be put everywhere, instead of that they go. Without a pleasant amount of eye, a dog has less to contribute to the job. We all like a useful partner afterall and that is pretty much what we are after. The dog with too much eye, the one that gets locked up and doesn't get up, really would not have too much eye if you could obedience him past the liability. If heavily eyed dogs could overcome their natural inclinations and do as we ask, the eye could be viewed as a pleasant thing. It wouldn't be too much.
We want the perfect balance--free enough to be responsive but with enough eye to engage the sheep. Very free dogs are adored by western sheep, as the sheep relax in their presence. Dogs with too much eye draw sheep back to them and predispose confrontation.
An honest trainer will know if he or she has trained past a propensity in a dog, like for example too much eye. It will position the trainer to make intelligent breeding choices with the dog at hand--breeding to a freer dog, if in fact the amount of eye in the bitch has been a problematic tendency. We all see dogs that may have had too much eye, but they rose above it in training to be successful dogs. They were trainable. They wanted to be partners on the job.