phrag grande repotting

[weederwoman]

I totally understand timely repotting of epiphytes, but why repot phrags yearly so the medium (ie. bark) doesn't "break down". In the wild there must be a natural breakdown of the matter the plant is growing in. To the plant repotting must feel like a rodent has dug it up. My grande has been doing well, but is 2 years in the same pot, and reading on care makes me feel it will suffer if I repot, and suffer if I don't. I also sense that roots have adhered to the insides of the clay pot, like my paphs like to do. Can these fuzzy phrag roots do this too? Thanks