We mainly don't have start/stop because the EPA testing doesn't reflect any benefit. During the testing, there is no sustained periods where the vehicle is stopped and idling (or not). Its just speed up/down.
The A/C thing can be remedied by a little extra cost. Heat exchanger manufacturers have incorporated phase change material (wax) into the heat exchangers to 'store cold/heat' for a limited amount of time. I think in the article I read it was 30 seconds. The additional cost was pretty minimal.
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