The metaphore is getting pushed past it's limit here. It's more like the flavor of what's in the cans. If a flavor that gets tested isn't received well enough to roll out nationally, like say sardine ravioli, it's not a creative failure on the part of the food company to not roll out the flavor. Even if there is some cultural context about the history of sardine ravioli that people might find interesting.
When WotC tests an archetype, they primarily want to know about people's gut reactions. That's the point of UA, to get that smell test. They want to sell every book to as many people as possible, so they want options that will appeal with no context. The Spore Druid was honestly just as weird, and got a lot of grumpiness on the forums, but it made it into the book because it had 70% appeal. The system is working for WotC.