You may not borrow my circular saw, ever. The problem with that assumption is that all of the reasons for using the right tools (axe, chainsaw) are gone; no sap, the tree is all dry wood, there are no fibrous sections in the bark, etc. That is the same problem I see all the time with evangelists for any tool. In order to make a rational, evaluated decision, all facts must be looked at as objectively as possible. Or to use an old quote "the right tool for the right job".