If all of that is possible, why not just provide a reliable basic income? Why does it need to feel like a politician is bribing you for your vote?

A basic income does not really change the amount of money people have available. You exchange paying some amount of taxes and handing the money to people qualifying for government benefits for paying more taxes and handing out money to everyone. You may save some money on the bureaucracy for figuring out who is eligible for how much benefits, you may make life easier for people having to apply for benefits, but you also give up the ability to match benefits to individual circumstances making some better and others worse off, you may create some additional incentive not to take a job, ... But to a first approximation everyone will have the same amount of money available.

"feel like" ?