I hope you find those orchid pots that you need. Clay pots are not as common as they once were and I haven't seen any of the really large slotted ones that I once used for my large Cattleyas in the early days (sold as azalea pots).
Roots. I do know you are right. My first orchids were Phal-type Dendrobiums bought as rootless, leafless single green canes with a tag tied onto the cane. Then the first Cattleyas were all bought from a florist and all that was left of them were green back-bulbs. Next, I progressed to nearly dead single-bulb Oncidiums found at a local greenhuose, all roots dead, of course. All of them put out new growths, new roots and all but one Cattleya eventually rewarded me with blooms. Don't worry, I know you are definitely the logical one here.
I confess that I like a challenge. For a time, it has been said that roots die after potting, especially when transferred to a different medium and, well, that intrigued me. :0
Have you discovered that some other types of plants do not fare well if their roots are disturbed after they have reached a certain size? I have encountered a few that, no matter how careful, they just slowly die after a re-pot. I do know how to pot plants but...ugh.