So what? Is 10 some mental limit of names for most population? If I can memorize 8 I can handle 12 or 15, or neither. Making up sub-categories is such a typical bureaucrat's approach to problems.
Why should giant planets be in same category as normal ones? Why mixing ringed with non-ringed? Why mixing moonless with moon-enabled? Gas/liquid ones and solids? I could go on for a long time.
Why should giant planets be in same category as normal ones? Why mixing ringed with non-ringed? Why mixing moonless with moon-enabled? Gas/liquid ones and solids? I could go on for a long time.