"my question is why catalogers [not just LC but PCC or otherwise], in those situations where 2.5C5 does apply, never seem to use the Option, especially since it is LC "practice" to "Apply the provisional option of the rule." What's inhibiting the application of the option, even in situations that seem to me to be relatively straightforward, such as an all-cartoon collection?"
As is frequently the situation I may well be missing some nuance here, but I think the reason nobody uses "all cartoons" or "chiefly cartoons" is because cartoons are illustrations. Would you also want to use "all fumati," and similar terms?
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