UC is and will continue to be a disaster. Homelessness has already risen by 50% . Paying rent directly to tenants may work in some pie in the sky tory think tank, where the idea is that those on benefits will 'learn to budget'. Even people to have the mental and emotional capacity to budget find themselves out of money and food at times. If you have a choice of buying food and heating, or paying the rent and you've no savings - you don't pay the rent. Yes, its wrong but I'm not convinced I'd pay the rent above feeding my children.
If you're long term low wage/unemployed, you won't have savings. You won't have a food cupboard stocked with essentials, you'll have shopped for that week or the next couple of days.
Rent arrears will increase. Tenants will be evicted, private landlords will suffer because rents will be outstanding. People will be seen as intentionally homeless etc etc.
I'm not his biggest fan but I want to sing OOOh Jeremy Corbyn.