The problem is the "race to the bottom". Sure, some grindy desk jobs can gladly be taken by AI.

What about the jobs that AI does poorly, but when the low cost is taken into account it's still seen as feasible?

Think of all the horrid DTMF phone menus and barely functioning voice recognition systems. We hated these as customers, colleagues, anyone who had to use them despised them

Cheaper than a receptionist, though.

Now imagine that level of frustration and poor service spread across every industry at every level. We're talking about a total collapse of productivity across the entire economy. Not only do people lose their jobs, but the work isn't even getting done to any standard, either.