first off if you're training for 4 hours everyday you aren't going all out and two, if you train for 4 hours everyday you need some schooling on how to train
Sooo....Now you are saying that overtraining doesn't exist, and arguing that if you are training for 4 hours you are overtraining?
I am playing with your logic and probably seem a bit irritating and I am sorry for that...But I think you are highlighting some points, some of which became the reason I avoid this thread usually.
1. People, for some unknown reason, attribute some mystical meaning and all kinds of back story to the term "overtraining"
2. People think it has something to do with being willing to work hard.
I agree that it is difficult to find a consensus on what dose of training constitutes too much, but there certainly is a specific dose that yields maximum results, which you seem to be well aware of in your statement above.
You can further define acute vs. chronic...But that isn't what is being discussed directly, the existence of OT at all is being questioned.
And I agree with you very much that you can work hard or you can work long, but you cannot do both. This concept slips by a lot in these discussions. If you are pressing your 1RM, you won't do it for very long before the best you can do is your 90% and then 80, 70, etc. At those points it may be taxing and challenging, but it isn't hard work from a strength perspective anymore...It is hard on endurance only.