I've never noticed a difference and sometimes I'll do it sometimes not. I cut mainly softwoods and I like about a dimes thickness gap between the top of the raker and my flat file laid across the teeth. I'm not saying there's anything wrong with rounding your rakers and I've known some people...
Maybe 'reaming' out your cuts every now and then as well to help clean out the sawdust, like backing off with the saw still revving and sliding the bar back and forth and in and out of the cut.
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