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9mm barrel

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Is their a legitimate reason to a ramped as opposed to an unramped 9mm para barrel in a 1911?

I understand the ramp from a operating pressure standpoint in a .38 super, but does the 9mm para cartridge operate at a high enough pressure to be a concern in a unramped barrel? Does the ramp allow better feeding with this cartridge than a unramped barrel?

Any help is greatly appreciated.
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As far as I know .38 super and .40 sw are the only calibers to take real advantage of a ramped barrel. I shoot both high pressure 9mm para and 10mm auto in non-ramped barrels without feeding and bulging problems.
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