First, I want to thank you for a good discussion. I don't always get people who want to discuss, but just argue.
I don't think it is as easy as you say.
There are many jobs that do not lend well to automation or we don't yet have the technology to do them.
I don't know for sure, but I imagine that a guaranteed basic income would cost more than the welfare programs we have today.
The other problem is once again, you are forcibly taking the fruits of one person's labor and giving to someone who didn't earn it. I always have a problem with that. If I decide to donate to charity, that is my decision. What right does someone else have to tell me that I have to give my money to someone else, for no benefit to me? Who determines how much is "fair", 50%, 70%, 90%?
The problem with taxing the wealthy at high rates is that in today's world the rich have options. Look at NY and Calif. The wealthy are leaving and now these states are in financial trouble. In Calif. even the middle class is leaving.