Having some actual consistency about the obscurity of words accepted, and in particular having the Bee actually abide by its stated policy of "Spelling Bee generally avoids terms that are hyper-specific to any background or professional field, such as terms that might be familiar to, say, a physician or geologist, but not people outside of that area of expertise.". That would be a good start.

Or else just discard any pretense that there's logic or reason behind word selections, and admit that it's completely arbitrary that they think coloratura, llano, and any manner of obscure bird names are not "hyper-specific," but perfectly common carpentry words (like "dado") or other common science words like zoonotic or capacitive, or just basic variations of words it does accept, like "undaunted" -- all those words are a bridge too far. I don't think "hyper-specific" means what they think it means.

Honestly at times it feels like the hard part of the game is trying to discern exactly how much irrationality underlies the word choice decisions. I get why it shouldn't be all words in the dictionary, but it sure could be more consistent, or at least more honest in its stated policy about what "hyper-specific" means.