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Is it necessary? No. Are the perforated holes helpful? I think so. Excess bench flour can burn and be bitter. The perforated holes will shake some of that flour off. If you're really careful with how much flour you use and work quickly, you shouldn't have any excess bench flour, but the holes are a good insurance policy.
CW, I made mine from 16 ga. aluminum. It comes in around .05 in. Steel for the same gauge is around .06 in.; don't know why. (I use wood to get the pizza into the oven an the metal to move / remove it for what it's worth).
In a land where we use sensible measurement .05 in is 1.2mm I used to make stainless steel peels from 0.9 mm 304 stainless steel, but now go a bit thicker to 1.2mm as the thinner ones were a bit floppy.the down side is that every time you put the peel into the oven it heats up fast which in turn is taking heat out of the oven.
The thermal conductivity of aluminium is way higher than that of stainless steel so in this regard the stainless is superior. i also don't like the way aluminium abrades so easily.