Bar bending an 063 is also common in the logging industry. I've also seen firewood collectors do it, or put it this way: they keep showing me bent 063 bars and ask me to straighten them as best as I can. It seldom works very well. Once bent, they are usually toast.
There is one other advantage to using an 050 bar. After it has a few hundred hours on it, the bar will usually accept 058 chain as well as 050. Once the groove gets as wide as 0.057", the 058 chain will usually fit. You can check this with a feeler gauge collection.