I tend to agree with the sentiment that prioritization makes the list work better for the 80% of users but may make it seem less intuitive for the 20% that don'

I tend to agree with the sentiment that prioritization makes the list work better for the 80% of users but may make it seem less intuitive for the 20% that don't live in your prioritized group. We're thinking of taking a similar approach to the way we display matching city names in an autocomplete input box. We have data on which matches are larger cities and we may hide some search results when there is a broad match based on the difference in size between the city matches. For example, if you type in "Vancouver", there is a much higher likelihood you mean "Vancouver, BC" than "Vancouver, WA" due to the significant difference in the sizes of the cities and their "importance". In traditional lists, both would be listed with Vancouver, BC on top. We're thinking of hiding "Vancouver, WA" unless the user continues to refine their input to "Vancouver, W" then "Vancouver, WA" becomes the most relevant result. Something similar could be applied here. Type in "Ca" and Canada should be the option shown until you add a "m" to make "Cam" then you will most likely show both Cambodia and Cameroon if their relative importance is too close to pick a clear top match.