And the problem would be?
Climbing ladders is not exactly a natural chicken thing to do. And going down a ladder is pretty much an impossibility.
Jumping and wing flapping are natural chicken things to do. 3' is nothing to a full grown chicken, REALLY. One hop combined with 2 flaps and they are up. 4' takes an extra flap or two. They do need "runway" space to come down, at least twice the height of the roost. Better to put in a half height landing bar or platform if you don't have runway space or maybe for older birds that may get injured landing if the roost is high.
That ramp is WAY WAY WAY WAY WAY too steep.
And they don't need it since your roost bars are tiered. They can easily get from the ground to the highest one but since you have the lower two, they will likely go up in stages. I bet if you watch, you will see that is what they are doing.
I removed the ladder a while back. Sorry I'm still trying to figure this out.