iridescent_slime said:
Oldschool comprises multiple art styles that don't have much in common besides their age. It's already an ambiguous tag to begin with and it's getting more ambiguous with the passage of time. Does this not strike you as problematic?
I don't see it. People will want to search for content that is "old"/nostalgic (see how ridiculously populated おっさんホイホイ is on both Pixiv and Nicovideo), and due to the passage of time, what qualifies is constantly shifting forward. As long as there's some kind of standard for updating the tag in place, it's a matter of regular housekeeping, not ambiguity.