I'll rock up to a meet, and regularly hit my packs with 10amps, usually cause I just want them charged quickly, I'd happily hit them with 20amps, but I was too cheap to buy the 20amp icharger.
I'd say most race packs should easily cope with 2C these days, can't say high amp charging me worries me as much as say charging with a bad quality charger, or maybe charging without balancing connected, and risk a run away cell failure.
These days whenever I read about some LiPo fire etc, I always think of the chargers, and my early B6 type clones, which had the most awful accuracy and terrible calibration.