I'd rather see those people using their time hiking mountains, watching tv shows, doing arts... than go spend their day at a useless job that will make them feel unhappy because of the lack of accomplishment.

Would some people watch TV all day? Sure. However, there are tons of people that are trapped at a desk for 8 hours a day browsing the internet and watching Youtube videos anyway. I don't see all that much of a difference outside of freedom. "Busy" in this context just essentially means must keep their butt in their seat for 8 hours. Giving people freedom with their time allows people to write books, make music, paint pictures, learn skills, create products, etc.

Is it all positives? Probably not. I could see issues with people isolating themselves with no requirement to go into an office. But personally, I don't think unemployment is worse than bullshit jobs. Being busy is not a good metric to go by. If I carry buckets of water back from the river all day, I'm busy. But that's incredibly stupid to do if I have running water.