Curious how such requirements were/are never demanded from any other policy proposal. They were just devised and implemented. If we took 100 years time for testing for every new law, society would come to a total standstill.

It's different with UBI though because it goes against the class interests of the ruling bourgeoisie. Demanding ever more tests is a pretext to waste time and never implement UBI. The best test is just implementing it.

This means we need to test in production.

Testing a universal program on small sample sizes will never give the data we need, so the next step is to implement actual UBI for everyone in an entire country.