This post is about faucets in general. Why do bathroom faucets with two knobs still exist? Haven't those been obsolete for decades? Put soap on hands. Turn knobs. Knobs are soapy. Rince hands. Hands are clean. Turn knobs. Hands are now soapy. The only really effective way to use them is to turn the water on before soaping up, which is wasteful.
Somehow, somewhere, there must be a market for this product. Who buys these things? People who forget when they're at Home Depot that those faucets suck-suck-suck-suck. Then they get home, and then they install it, and, oh crap, this thing sucks! But, they've already installed it, so they're just going to live with it for a decade. By the end of the decade, they've grown accustomed to how much their bathroom sink fixture sucks.