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You bring up good points. Upon further reflection, some sporadic starting and idling here and there, in the big picture, isn't going to hurt anything but I doubt it helps anything either especially if it isn't done for long enough for the oil to reach operating temp and burn off the cold start impurities i.e. moisture and blowby. So just idling until the coolant temp gauge says it's warm may not be enough.
Years ago I did that sort of thing, then I stopped doing it... I can't say there was any quantifiable difference in the spring as to whether there were carb/fuel issues or not. So for me that's just another reason to not do it.
At any rate, the data re: idling being one of the poorest ways to "warm up" remains true and it is especially poor practice to do that on a regular basis.
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