Is it not always the case, that a outerdefense is supposed to be attackable to a greater degree then the main defense?
The Pelenor was not supposed to fend of a fullscale attack for ever. For that task Minas Tirith had a Wall. It was supposed to hold an enmy from some time and let the attacker pay for the crossing in greater numbers then the defenders to hold it that time. And in addition it was usefull in any smaller attacks.
When we consider how time critical the defense of Minas Tirith became in the end, I can only say that the hours that Faramir gained, saved the city.
Respectfully
Findegil
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