I might be one of the few post that openly allows my Max to roam about freely... but he is a macaw, not a small bird. But Max arrived to me as a floor dwelling creature (he is adopted from a parrot rescue, or more that he adopted me). We have numerous beautiful large java playstands and Max has absolutely no interest in being up high on a playstand. And Max is my shadow, he follows me about often, or at least will follow to see what I am doing and if he is satisfied I'm safe, he waddle his butt back to one of his play areas or he has a chair from an old dining set that he claimed as his food stand, and he also is potty trained himself, he climbs up on his chair, poops and climbs back down to go to his tunnel or the stair landing where all his toys are. I keep a towel under the two chairs he frequents, easy for cleanup.
Max is flighted, but he does not like to be up high and while he can take off from the floor, stand, counter or about anywhere, when he lands up high, he won't turn around and take off and fly down. We joke no one told him that he is a macaw that should be up high... He had lived in a home with a large cockatoo for 25 years (so reported when he was surrendered), so that may have formed his habits.
Max's lifestyle would not likely fit or work for many homes, but we have no children and our cats have trained / taught that their area is the lower living room or my bedroom that is a cat haven with a huge playstand and overstuffed chair in the bay window sitting area. And that was done specifically so the cats want to spend their time there, I do not encourage any interaction between cats and birds.
But the irony... my bare eye cockatoo, which is by nature a ground forager and should be on the floor, is the one who likes to be up high. She loves the high row of windows we have in our home and she does make use of all the javastands. So I have a blue and gold cockatoo and a bare eye macaw I guess!!
Having Max on the floor does mean that the vacuum is never put away and always checking on wires or anything left on the floor that is not safe for a bird beak.
But again, many would not be able to have a macaw live the lifestyle that Max does, but I am home almost all the time with living with MS, so he does live more like something between a puppy and a child

But it is not something I would encourage for all homes or families. Again, Max arrived to us as a floor dweller, it is just our job giving him safe play areas! He has claimed the space between the sectional sofa and the wall, so there is a play tunnel for him there too, which for some reason he has always loved.