No, there a lot of people who have no idea what to do when they have free time.
There are lots of older people who go back to work, not because they need the money but because the need the structure. In fact, there is an increased risk of death due to retirement.
>Available evidence suggests it is unlikely that changes in health insurance and income can account for the increase in mortality at age 62. So, to further examine the plausibility of retirement leading to higher mortality, Moore examines which causes of death increase when men turn 62, and considers the connection between those and decreased labor force participation.
https://business.purdue.edu/news/features/2022/retirement.ph...
>With utopian UBI, one would be free to do what they want.. even if it's just jagging off the whole day.
People have need to feel like they are doing something. Usually something positive but they will settle for something negative, generally that ends poorly for society.
Also UBI would only, as my understanding is, take care of the basics. Food, shelter, medical care. So you would end up with a population that has enough to survive, hungry for more and no way to achieve it.....