The point is that, unlike consumer loans, such loans require that the borrower has savings before they can take the loan. For example, most people who take a mortgage do so because they don't want to save money for 30 years before they can buy a house. They want to buy a house now, and save later. A mortgage loan allows them to do precisely that.
These other loans don't, and so they're less useful. They aren't completely useless. It's just that in most circumstances they aren't useful.
