If employers paid decent wages there would be no need for anyone to claim benefits.That's always the left wing argument. Find an example of someone who is genuine misfortune and and use that as an argument to block an entire policy that would actually benefit the majority.
The need for the delay in the start of benefits in universal credit is definitely a hardship that needs to be addressed. However, the concept of a simplified benefits system where people are clearly better off when working is a no brainer in my opinion. Part of the resistance to Universal Credit is the fact that its a lower paying benefits system than the previous systems and people on benefits understandably don't want to see that cut. However, unless we find a way to break the addiction to the government subsidising those who choose not to work or are on low incomes (oh, how about increasing the minimum wage?), the benefits bill will continue to spiral upwards and place more and more tax load on those who do work or are in the higher income tax bracket.
Working people would pay more taxes while the need for taxpayer subsidies would reduce.
The unemployed would have more incentive to get a job rather than sit at home all day planning the next holiday to Benidorm or smoking dope.