What would putting flour on the pot roast prior to slow cooking it achieve?

I saw an add on FB on how to slow cook a pot roast. I’ve been slow cooking pot roast for a million years. It’s one of my top 5 best dishes.
But in this ad it said to roll it in flour first. If I was frying it, it would make a nice, crispy coating, like fried chicken, but this is not frying. So what is the point of coating it in flour (besides getting dork fishes like me to click on the ad) before slow cooking in the crock pot?