I think I can say that every large group I know of uses ambient air temps and does not rely on hot spots. I know at least two zoo set ups that also rely on a ambient base with small adjustments here and there to provide heat to a wide variety of species. It is the most efficient system for a mass grouping.
Should everyone use it, no. Husbandry is always a balance of animal needs, keepers abilities, local environment, and available technology. There is no right or wrong way there is only what balances and what does not. The balance depends on too many factors to make a sweeping statements.
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