The biggest argument for keeping the clutch fan is diversification, which is never a bad idea. With the clutch fan and the electric aux fans, you can suffer a mechanical or electrical failure and still have cooling. With all-electric fans, if you have an electrical system failure, you lose all cooling, all at once. (Likewise I suppose with removing the aux fans, but I've never heard anyone advocate that.
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Another advantage of the clutch fan is that mechanical systems tend to fail gradually and give you warning ahead of time in the form of noise and vibration, whereas electrical ones tend to fail suddenly and/or catastrophically.
Whether or not this bothers you is a personal choice, but regardless of how you feel about it, going all-electric is putting all of your eggs in one basket.