Exactly.. my personal genealogy for discovering UBI was:

The government should provide for a base level of food, medicine, housing, and education.

But let private industry compete for it, so just provide vouchers for each of those things.

But, how to efficiently allocate the amounts for each individual? How much health care voucher vs. food voucher vs. housing voucher vs. education voucher?

Ah, just have a universal “health or food or housing or education” voucher!

Oh, but what about transportation!

Okay, a universal “housing, food, medicine, transportation, and education” voucher.

Oh wait, we have one of those already! The dollar.