If you mean "why does the rule exist?" then that would necessarily involve speculation on my part. I would guess, however, that it's because, while a character's best abilities improve as they progress through experience, the abilities that they've never spent any points on at all, even in character generation, don't (by definition). Thus, the very easiest tasks are being set relative to that unchanging "worst ability" value once the character has passed a certain level of competence, rather than the "best ability" rating that the base resistance is supposed to reflect.
But that's purely a guess on my part, and may be quite wrong.
-- Trotsky Gamer and Skeptic ------------------------------------------------------ Trotsky's RPG website: http://www.ttrotsky.pwp.blueyonder.co.uk/ Not a Dead Communist: http://jrevell.blogspot.com/ Synapsida: http://synapsida.blogspot.com/
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