UBI doesn't stop people working. It just stops them starving if they don't/can't work. It allows them to re-skill without risking ending up on the street. It provides a safe path out of poverty traps.
People will always get bored and people will always want nicer things, so they'll always eventually be motivated to go and get work to improve their lot. UBI won't change that. In fact, it will facilitate it.
UBI doesn’t do that. Unless tied to something like land-value tax, UBI just raises rent cost. Of course it doesn’t happen immediately, but within a year or so UBI will be consumed by rent cost.
People will always get bored and people will always want nicer things, so they'll always eventually be motivated to go and get work to improve their lot. UBI won't change that. In fact, it will facilitate it.