> Worse still, moving back to chair-making after a year or two, you discover that the old machines you knew are now obsolete and you have to re-learn how to run

> Worse still, moving back to chair-making after a year or two, you discover that the old machines you knew are now obsolete and you have to re-learn how to run their replacements. Love your analogy, it's all spot-on. On the above, I'll add that the new chair-making machine is hardly ever better than the one from 2 years ago that you saw, it's simply all completely different for the sake of being disruptive to you its user. Most of the time it's actually worse, with fewer features and more restricted customization.