It is not there to buy food and stuff directly with Bitcoin. It is used along with Gold and other stable assets to preserve the value of an high inflationary local currency. If you need some cash (at the current exchange rate) you just sell some bits for cash in order to buy food with.
Having an option to purchase goods with bitcoin is always a welcoming thing as we can have the choice on how to spend my money and it is sure that bitcoin is helping countries which is having economic crisis and these are the major changes that could say that bitcoin is better than cash.