Conversation

There's a distinction that's probably only obvious to people with some grad-level math: Corner cases are not the same as rare cases. Neither implies the other. "Corners" are a measure-0 subset of a space where open-nbhd/non-singleton methods don't apply Ie "special treatment"
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You're conflating normative concerns ("good" tax laws) with phenomenological. Alt example with no normative angle: special-order catalogs are harder to abstract than combinatorial product offerings like Starbucks menu.