Then there is no safe way to fail. It would discourage innovation. You would have to stay with what works; even if you don't like it, it's getting harder to iterate, or there is a solid wall in the near future that you know you can't cross.

Well now you've significantly lowered the benefit of a UBI in our fully automated future. Before it was "if we don't do this then 90% of people will literally have no money and won't be able to live." You've changed it to "innovation among entertainers will be discouraged."

I think you might be able to get people on board to support the first justification. The second one is going to be a lot harder to sell.

I did no such thing. I only countered one specific scenario that you proposed.

Both justifications exists, along with an multitude more justifications.