I wholly agree with your statement that we need more productivity and not less. The economy is getting better and I remain skeptical that automation will do away with jobs. The economy is changing but not shrinking in terms of jobs.
I am sympathetic to Yang’s UBI because it will simplify the unwieldy government aid programs (money and money-like programs). As a Libertarian, I would like to see as much government bloat eliminated as possible. Abolishing all these programs is unlikely. The next best thing, a compromise position, would be one of replacing an unwieldy system with a more efficient and cost-effective one.
We do need skills training (though I would never trust the government to do anything productive if it intervenes here). The best approach here seems to be one centered on apprenticeships, workshops, and trade schools.