Heck yeah! Socialize socialize socialize!
But that isn't about teaching obedience, is it? It's about teaching life.
I'm saying that during the teaching phase (which for me happens to involve treats), stress is, for me, probably counterproductive.
Yes, the dog has been socialized like crazy.
And the dog will be "stressed" by distractions after the teaching phase.
Aside from the level of stress in the distraction (or proofing) phase, I'm not sure we (anyone) here is arguing against stress in obedience. Maybe we are arguing about when the stress is introduced (and remember that if it's not stressful to the individual dog, it's not stress).
Andres stated (I think) that stress in obedience was a "way" that was NOT the "way" that involves tangible rewards (quotation marks his).
I maintain that the tangible rewards are used in the teaching phase only, that they are phased out during the one-in-three phase, that they are not reintroduced unless a different teaching phase is, and that stress can be any distraction, including but not necessarily doing that ob up in the air or under fire in a dark room.
I think I train stable and confident dogs who don't have to go through a gunfire-crowded-dark-room phase because that's not what their lives will be like.
Recap: I don't see (again) how the teaching phase that involves rewards and the distraction (and correction) phases that follow are mutually exclusive.