It's interesting; not the chicken roosting part, but the human reaction to it.
We seem to believe that chickens should roost off the ground on whatever we can faishon as a substitute for a branch. That's fair enough given the evidence.
But, we still can't fully grasp that chickens need a lot less help from humans at least, than we are comfortable in believing.
The two 11 week old cockerels Dusty hatched slept on the floor of the maternity coop until about a week ago. There's a roost in there, and Dusty took them up to try it at 6 weeks, but after two nights, the chicks and their mum were sleeping on the floor again. When Dusty went broody again when the cockerels were 8 weeks, they slept together on the floor a few feet away from her nest. But they didn't bother her or try to get under her once she had eggs under her and hissed them away. They just wanted to be close. As Day 21 approached and I wanted the coop available for new chicks, I took them over to the main coop in the evening and put them on the extension roost.
The next night, I took the pair over a little earlier and put them on the ground next to the roost. The other chickens were starting to roost as well and of course were giving the two newcomer cockerels a hard time. I guess it's tough for young juvies when their mum goes broody again so quickly and they don't really get a proper introduction to the flock. But the two cockerels just hopped up on a low wall and waited it out. I left them to sort it out. When I went back to check as dark was falling, the two cockerels had gotten on the roost bar themselves, as close as they could to the other chickens.
The next evening they waited until dusk and then made their way over to the main coop themselves and got on the roost.
It made me recall what
@Molpet said about proximity -- it seems like the two young cockerels just wanted to be closer to other chickens, either on a floor or a roost.
Tax. You might remember Segundo, the little cockerel who used to follow me around after losing a fight to his brother Tobias. I found him a new home up the road from our farm, with neighbors who recently moved to Ecuador from the US and want to do "all the homesteading things." We made a coop and brought in two POL pullets for him to court.
I was a bit worried because down here, there were three 5 month cockerels and they had basically formed a gang and were marauding around like the Peaky Blinders on a whisky binge wreaking general havoc. But I broke up the gang, their personalities changed for the better.
Segundo, now a confident in charge soon to be rooster.
Tobias, now comfortable in his role as Lucio's junior and main protector of young Prima, who just started laying very pretty little green eggs.
I hear that the third cockerel Han Solo, is doing well in his new home at another neighbors farm as well, with two hens who have accepted him. He will likely get eaten when he's 10-11 months old, but at least he is getting a chance to mate and further his genes with willing hens.