I was unaware that the saw stop people pitched the idea to other manufacturers first. I think he does have a legitimate case if that was the fact. I don't believe however that even if that saw company did agree to the technology that it would be on that saw though, it would make it to cost prohibitive for people to buy such saws. However that being said if they did have that technology on other saws in their line then the claimant would not have a case.
I don't think it negates peoples responsibility. he bought the saw after the technology was rejected. If the technology was on every saw the price of that technology would come down quite considerably, it would have to by the simple laws of supply and demand. If it was to expensive it wouldn't sell.
Items are never sold for what they are actually worth they are sold under the idea of what the market can bare. Electronics are proof of this.