Even something as simple as "planets" contains "major planets" and "minor planets" would have avoided 20 years of people arguing about the names instead of caring to learn what's different about them. But you never hear people explaining why the IAU insists "dwarf planets" aren't "planets" even when "dwarf planets" has several subcategories which don't share the "planet" moniker, you just hear people argue about missing Pluto or call other people ignorant of the technical details of the categories.