I don't grow any Catts, so maybe I shouldn't even be responding here, but I do have a few plants that do exactly what you describe. I've kind of come to the conclusion that maybe it's a sign they shouldn't even be in a pot.
The plants that do this for me are some hybrid Oncs. I've had them for years, tried different standard type potting mixes and still the best roots they produce are all outside the pot. When I do repot, most of the roots inside the pot aren't in the greatest shape anyway.
When I saw your question, I thought of a photo I had seen of a whole bunch or Phals that had been mounted on a concrete wall. It was from somewhere in Asia. Those roots were just amazing. They had grown out from the plant in every direction, absolutely glued to that concrete. They almost looked like a spiderweb. Needless to say, the plants looked very happy this way.