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Defense to Opposing Actions Showing Two Suits

I was talking with one of my partners about defense to Michaels and Unsual Notrump and we noticed the following curiosity in the way these defenses are often played.  I quote from Bridge World Standard, but at least some other sources would provide the same answer.

'In responding to a major-suit opening over an artificial action:Over a bid showing two fixed suits:(b) the cheapest cue-bid (actual or virtual) is a game-invitational or stronger raise;(c) the second-cheapest cue-bid is a one-round force with the remaining suit."

"In responding to a minor-suit opening over an artificial action:(b) the cheapest cue-bid (actual or virtual) shows at least game-invitational strength and the remaining suit; the second-cheapest cue-bid (actual or virtual) shows a game-invitational or stronger raise of opener's minor."

Why have the cheapest show a raise after a major suit and the cheapest show the fourth suit after a minor suit?  It seems like it'd be easier to avoid mixups if all of these actions were consistent (with cheapest always showing own suit or cheapest always showing support).

Are there theoretical reasons why it'd be better to have different answers in different situations?

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