Well I wont say your wrong but who ever keeps their horses in a stall with no bedding and concrete floors should be slapped in the face. The horse could slip on its urine and hurt itself really bad!!!!
Now I think that horses now a days are considered domesticated and us humans alter all domesticated animals like cats, dogs ect. That yes I think its well better to stall at night than not too. Like my horse want to come in at night they stand at the barn door and just paw and paw til I let them in. I feel safer that my horses are in that way they can have some down time and let there gauds down. Also get a good night sleep unlike they would get outside always watching there backs for danger. Plus I do not heve an out door shelter so if it rains there nice and warm not wet and cold.
Another thing is I do use hay racks and I do use feed boxes because if I didnt my horses would waste their hay by pooing and peeing on it and they would spill there grain all over the floor. Its just so they have pleanty to eat without them wasting any. I do this all for my horses well being and comfort. Not so its easy to grab them or to keep them clean!!! Like you said its my thoughts
Also sorry im a really bad speller so sorry if my grammar is off!!!!