"We still need to fill these jobs, and a generous basic income would make these jobs highly unpopular. So we can either set a basic income that is not high enough to solve the problem it was trying to solve, or we create a situation like in Saudi Arabia – where all the undesirable jobs are taken by foreign jobbers "

Or we could just let the wage for those undesirable jobs rise to a level that someone will take them, even though they're getting the basic income.

Why shouldn't someone get paid a lot of money for (e.g.) trimming my toenails? Someone else would have to pay me a lot of money to do that.