I’m familiar with the arguments on how higher minimum wages may harm the lower classes, but how would UBI “devastate” them? We can bring back the manufacturing

I’m familiar with the arguments on how higher minimum wages may harm the lower classes, but how would UBI “devastate” them? We can bring back the manufacturing, but the jobs are highly unlikely to follow. Rather than 800 unionized workers working the assembly lines, it’s 8 robotics technicians overseeing the machines. This ratio will, obviously, vary depending upon exactly the product being manufactured.