Your #1 asset is your income.
Everyone who works and earns a living probably needs disability insurance. If you suddenly became disabled and were unable to work, could you still meet your financial obligations? Could you get by without having to use savings or borrow from relatives? If not, you’ll want to make sure that you have adequate disability insurance coverage that is designed to pay your expenses while you are disabled and cannot work.
Should you rely on social security? No. Because you have to meet a strict definition of disability to qualify for benefits from government programs (e.g., Social Security), you shouldn't rely on them as your only sources of income if you became disabled.