Round per round fired in practice, time behind the bead, a semi will result in a faster rate of fire.
Does 3 shots a second make you more effective than 2?
Is a pump fast enough for defensive use? Sure. Is it reliable for a low time, low skill level user? The Police seem to get by with it effectively. Would a semi be an improvement? I'm not sure, but I think the training curve would be easier.
Also, regarding the lack of a disconnector, I've compared shotguns with and without on pepper-poppers with a timer. I found I did better with the disconnector- the cycling closed of the pump handle tended to make me drop the shot down by the 4 or 5 o'clock on guns without the disconnector.
Of the Police shotgun encounters I've read about, they all seemed to end on shot #1, so draw your own conclusions.
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