Right totally agree. we should see if parrots can adapt to aquatic set ups. Why would we want to mimic anything natural?- - - Lol Just Kidding
You are right, in captivity these animals don't have to do anything at all. and if it likes to climb, climb away! But you would figure that all the folks who have been doing this for a lot of years would have arboreal cages if that was what ideal conditions would be for the snakes in captivity.
I didn't say to change anything. If the snake is healthy, eats well and seems happy, its fine. The cage is above and beyond good enough. It has more than enough floor space, and it has room to climb since this guy likes to. The OP has a good looking snake and a nice set up.