I think I agree that in principle, if you have a balanced life safe from risks and danger, or faulty appliances with a reliable cheap bus service, an allotment and a home that isn't drafty with not too many children you will be able to manage on JSA for a few months.
But after a bit of time of being unemployed things start to go wrong, a leak in a pipe, a broken down washing machine, things that may set you back and if you can't pay for the repair you will end up with further problems. Dirty clothes, damp and mould, it all creeps up very quickly. You may lose your self-confidence a little, want to go out less, not afford a haircut. All of these things added up make life on benefit no longer about 'being able to feed the family for a week', but about 'what can we afford to tackle this week'.
What this country needs is employment - whether it is paid or voluntary, we need to get people being productive before they become unemployable.