The rate at which we've been developing tools has been increasing, and has also required more specialization. You cannot switch jobs easily from being a software engineer to a heavy equipment operator but they both use sufficiently advanced tools. Looking at top level employment metrics is also hiding quite a bit of information. Time is required for people to learn new skills. If a sudden influx of people were all heavy equipment operators then the market will price that in and suddenly that job is the same as mopping a fast food bathroom.