I know that UBI, on paper, looks like it’s a good answer to many of the challenges listed at the end. But I don’t think that UBI, once put in place, would be as strong, politically, as other universal programs such as universal social insurance: => Round #1: new left-wing government enacts UBI with appropriate funding. => Round #2: left-wing government loses elections, new right-wing government decides to target UBI on the poor in order to master the costs. UBI becomes BI without the "U". => Round #3: the rich find that their taxes are too high and denounce the BI-claiming poor as welfare queens, contributing to the right-wing government winning reelection and weakening BI even more.
There are two kinds of universal benefits: the rich (and the middle class) all need universal health insurance (in case they have cancer), but they don’t really need UBI because they earn enough money from other sources.
So I’m not sure why, even if they’re supportive at the beginning, they would keep on supporting UBI under the inevitable ideological and financial pressure that comes with a polarized democratic society.
Considering this perspective, my understanding is that all the energy thrown in BI-related discussions is wasted while it could be invested in favor of universal health insurance for instance (which the US still lacks even with Obamacare, and which could benefit for the attention and design skills from the tech community).