I see, I think we are pretty close to the point of debating how true a truth is. I think the real difference between the disciplines, in the application of log

I see, I think we are pretty close to the point of debating how true a truth is. I think the real difference between the disciplines, in the application of logic, is highlighted by your use of "coherent". While an engineer will work mostly to build upon a set of precepts, philosophy is charged with the responsibility of deconstruction. Of the two, who is spending time wondering about the abstract concept of the number one? I think that focus on local coherence is what led philosophers in the dark ages to debate whether Adam had a navel, as the premise was left unchecked. So I'd say that philosophers go astray when they do not focus on logic.