I tend to go more by how it looks than actual measurements. I prefer to keep a more blunt hemline, so yes, I would trim if I felt like my hair was getting too thin at the ends.
But it really depends on the individual and how you like to wear your hair. If I did more updos, I probably wouldn't mind some extra taper, as I've heard that's easier to work with. I wear mine down or in a ponytail or braided almost 100% of the time.
If your hair is healthy and you are happy with how it looks, then there's no reason for you to feel like you should cut it. And a lot of people complain if their braids are very skinny at the ends, but I think it looks just fine.
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