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avr chips work fine on 3.3v @16mhz even though not guaranteed
There are already so many things that can go wrong with a robot project; why recommend that people add another thing to go wrong and be unsure about?
they know something that you don't: there are enough cases of failure at 3.3V/16 MHz to only specify them for 5.0V.
why many report that it works fine at 3.3V