Lets say you have enough spare time and energy to make a jig, a trolley, an improved tool of some kind that helps you hang siding. For the time you spend making it you are behind on your general average siding panels per day. Once you finish your tool you will surpass your average. This is one of many many non-linear holes in your theory.
You may say 'but you can't guarantee I will make a jig, a trolley or an improved tool', at which point I give up trying to argue with someone on the internet and feel slightly deflated that the point was missed
