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New riders, sure. Extra thing to manage time wise.
If you are on street tires, no warmers needed.
I do hope tracks realize that power isn't just for warmers though. It really is nice to have a fan and other small powered conveniences available to participants. Hearing generators constantly generally sucks, but I won't fault someone for using one is there isn't any power available.
I guess we're just spoiled by NHMS.