Well, intentional or not, cultivars are simply a way to connect a unique name to a written and published description along with a photograph illustrating that plants unique characteristics. I understand that Dr. Jan Schlauer, by use of previously published works, was doing his best to catch up with plants already in cultivation, he recorded registrations for those plants already having met the criteria for valid cultivar registration - perhaps unintentional by some authors but valid nevertheless.
Several, very popular cultivars are published in the book Insect-Eating Plants and How to Grow Them, written by Adrian Slack, so I finally located my own copy for $56.00 plus shipping, through Amazon.com. I anxiously await its arrival, so I can finally see a copy of this book for myself.
Of course, no one is "required" to use cultivar names, or any names at all. Its simply another tool to assist communication about our plants. As I've mentioned earlier in this thread. I've already acquired several plants, each labeled as [(Huahuapan, Illuahuapan, etc.)] and several appear to be distinctly different from each other, while others appear identical to each other. My notion is to check them all against the published description and standard photograph in an attempt to validate if any of them are the cultivar Pinguicula 'Huahuapan'. If one or more meet this criteria, I see no reason not to use the cultivar name for it. At least that will reduce, by a small amount, the level of confusion concerning the name, (Huahuapan), as it concerns Mexican Pinguicula. My major motivation in supporting plant naming conventions, after all, is to know as much as I can about the plants that I grow.
I could rename every plant that I receive, giving them names of my own choosing, and then redistribute them to the CP world. My name, would, most likely, be remembered in infamy after that. I rather, choose to do my best to support the efforts of those who create and refine the established methods of naming and identifying the plants we grow, to positively identify those plants I receive; learn and use their correct names as accurately as I am capable of. Cultivar registration, if used, can help all of us to keep the names and their respective plants, together.