By your logic, UBI is a significantly more conservative idea than our traditional means-tested, piecemeal welfare system. UBI gives people money and gives them the freedom to make choices with that money. What don’t you like about this? Would you rather just say “oops, you made a bad choice and wound up in poverty; screw you and all of your descendants”? That seems pretty antithetical to advancing as a society.
I agree that telling people they can’t earn over X amount of money without losing their benefits could have motivation-killing side effects. That’s why UBI has be universal in order for it to work.