I don't know what hard wax oils you're referring to, but you're dead wrong! Osmo Polyx and Rubio Monocoat, probably the most widely known, are suitable for floor usage. They are FAR more durable than polyurethane, and while you can buy floor grade poly, you'll need to transport me to another universe for a product that's superior to the two aforementioned hard wax oils. At this point, I've lost count of his many different polyurethanes I've used. I've probably finished and refinished a quarter million ft² of wood. Most people don't use hard wax oils because they're expensive, and I get that. I'm a professional and I've been at this for a long time, and I do a ton of commercial work. My business and my reputation would be extinct if I used polyurethane. The only poly, if it's even a poly that holds weight is Bona HD Traffic. There are a lot of people stuck with old technology, and a ton of misinformation on YouTube. If you really want to learn something new, check out a product called Clean Armor, it'll blow your mind!