I don't start cutting 'till it is up to speed. The kick back I'm referring to is simply torque reaction. Nothing to do with cutting - it happens even with no work in place.
There's always a chance a small offcut will fly - but this can be minimised by using the correct sharp blade. And of course you do always wear eye protection?
I do indeed. But I reckon it's the safest type of power saw there is if used correctly.