The main reason I don't believe in UBI roll-out is that most jobs in existence right now are already bullshit jobs that could be removed without productivity loss.

Jobs are primarily to keep people occupied and busy, not to actually provide productivity gains.

It's more than likely that AGI will make it possible to replace all human labor but everyone is still employed through bullshit jobs that contribute nothing to society besides keeping everyone occupied.

Lockdowns proved that most jobs aren't essential and nothing gets lost when they aren't done.