There are a few reasons not to switch it but first you need to work out how much power you are dissipating the regulator.
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If the MEGA has an SMD regulator then all of the heatsinking comes from the area of copper under the tab. If you start dissipating more power for the same heatsink area the regulator will run hotter.
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Having a lower current limit is useful because it limits current in the event of an external fault.
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The higher current regulators typically have a higher dropout voltage which
increases the power dissipation and the minimum input voltage.
(* jcl *)
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