I think it’s because it’s ignoring the impact of concentration and the range of affected jobs. When, say, people switched from animals as the primary source of motive power for shipping, relatively few people immediately lost their livelihood because the things now using engines still employed tons of people (a delivery guy had to learn to drive but the rest of the job was similar) and a bunch of new jobs were created.
Now we’re being promised a wide range of white-collar jobs all being affected at the same time, always in a way which reduces the number of total jobs and concentrates power in people with assets. The position that people will find new things is begging the critical question of whether those people will have the money to get started or customers who can afford to buy from them, especially when sharecropping using someone else’s models with no guarantee of non-competition.