The entire premise is bullshit:

The problem with UBI is that it hides income inequality.

No. Income inequality is not hidden by UBI.

Based on how you frame "the problem" you clearly don't know jack shit when it comes to UBI, something that has been studied for over five decades and which not only has been thoroughly demonstrated to bridge the income gap again and again by lifting people out of generational poverty, but in follow up studies with the numerous participants it demonstrates a long lasting and enormously positive effect on the participants and their communities, which is what it was intended to do.