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I think it's because the higher end 1911s are finished to higher tolerances so they can't tolerate the build up of as much crud. The 1911s from the WW1 and 2 weren't the hand finished 1911s that are out there now.

I think relying on a manual safety or a heavy DA first pull breeds complacency. There are people out there who will think that because its harder to pull the trigger it will be ok to lower their guard/handling procedures. The safety and heavy trigger are more like a crutch.