Basic income has a whole host of pretty interesting self-reinforcing feedback loops that seemingly would improve things overall.

For example, people would be more likely to leave jobs that were unsafe, treated people poorly, etc. Including situations where employers weren't following labor laws and regulations (which is a huge problem today). Meaning that maybe it'd be more likely that the fire code, sanitary regulations, etc. were followed consistently. Additionally, people would be more able to have the flexability to be able to train for new careers (whether on their own or through a school or program). Shifting the balance of power in the job market to labor would also generally improve the wage situation, which has stagnated for the last several decades due to the growing power of employers.