Some day I will learn not to enter this one but... not today.
I have never found tubs to 'hold' heat at all. Perhaps I have different idea of 'holding heat' to me that means it stays warm for a while after the heat is turned off. I have never had a tub 'hold heat' for more than 4-6 min and it is at room temp. Based on my experience there is nothing worse at holding heat. Tubs offer space savings and flexible ventilation, as humidity is partially a product of ventilation that too I guess. Heating them is easy if you only talk about a hot spot when you add ambient and cool spot it is tricky. There are limited heating options with tubs, why most tubs in racks are in warm rooms.
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