Just for the sake of argument is it more difficult to ascertain the needs of an animal who has never been kept in captivity or an animal that has the needs of two species with well understood captive needs?

Since mainland species and island species of retics are isolated it would not suprise me if they are found to be separate species in the future.

As for muddying gene pools, dishonest people will do this regardless of the opinion of the rest of the hobby to make a buck. If you create a situation where hybrid snake breeders are accepted in the hobby then people will be more honest about lineage.