Minimum guaranteed income is the beginning of the end. From a humanist perspective it is great, but that is short sighted. Human beings are goal driven, strip away the necessity of that basic human drive and who knows what can happen.
I am never in fear of starvation. Western civilization was built on the bedrock of contributing to society through labor. It's how the system works. That whole system will have to change if that axiom disappears. It is very naive to think that wont have a massive effect on mate selection, how people spend their time, morals, etc.
This isnt purely about economics. There are other deeper issues at play when you say people no longer need to work.
Sure, everyone will keep being disciplined, waking up early to a work a shitty office job. They will keep doing data entry for 40k a year and cleaning up public toilets for 35k a year. They will put up with massive stress and the risk of being laid off at a large corporation
Would this work? Isn't it like "everyone above average"? If everyone gets a minimum amount of money, money will be worth less. It would make more sense to guarantee certain resources, or more targeted welfare (e.g. that comes with requirements on how it is spent).
"Idle hands are the devil’s workshop"