You'd have to ask the various club why they don't like non-hardcased lipos.
Personally I've killed about 3 soft lipos in the past year. One, I dropped some solder on it at Tamworth, so didn't want to risk running it. Second, something went wrong with the motor or connections which led to smoke coming from my car. Can't remember what happened to the third one, but in all that time that I've been runing micro lipos, I've been running 1/10th TC hard cased lipos, with no problems.
Also, Trakpower has new hard cased micro lipos on they way, as part of their dark series, but they're yet to be released.
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