I’m one of those seemingly smug homeowners blessed with a bathroom boasting double sinks. And yes, it is nice to have some separation from my husband’s shaved-off man hairs. But I have a lot more to say about this beloved amenity, and—brace yourself—it’s not good.

Double sinks are revered as a must-have across HGTV. Interior designers and house flippers alike say they elevate a mere bathroom to a whole new luxurious level. And if you’re thinking of dollars and cents (and frankly, who isn’t?), double sinks are a smart return on investment. If you ever decide to sell your home, buyers will very likely enter your bathroom and gush, “Oh look, honey, double sinks!”

“A double vanity in the primary bathroom is a must if the space allows, but it’s also practical since it adds value to your home,” says Jamie King of JLK Interiors.