Well, the problem is that the means tested benefits are very ineffective. THe rules are complicated, and not very fair. A lot of people are living beneathe the poverty line, but get nothing. Some people game the system.
THere is little incentive to take a part time or low income job, because you lose money, but for many people without higher education, this is the only option. Getting a college degree is too expensive for big parts of the population.
So we need a UBI, and we need it now. And free education.