I think HW doesn't want people putting their motors to it's limits and complaining to them if it breaks.Hobbywing says that motor can only go up to 6S. I believe manufacturers know best when it comes to their products. If the motor was reliable on 8S, then Hobbywing would advertise it that way.
https://www.hobbywingdirect.com/products/ezrun-max-motors
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