I think it's a false assumption to make that there would be devastating, society stopping labor shortages with UBI. I will contend a lot of jobs today are useless (or worse, actually harmful). Many things can definitely be automated as well. I'm sure we can come up with janitorial robots, we just haven't because it's cheaper to exploit people.

The goal of society should be to become post-scarcity. All of our technological progress has led in that direction. We currently just live in a period where the majority of the gains have been captured by very few people and that has allowed them to exploit human labor to enrich themselves vs. building a self-sustainable society. Engineered or not, I think that's the inevitable end game of continuing humanity.