Just my mostly uninformed thoughts. Possibly massive added expense for electricity to maintain the temperature of the water. Maintenance can be somewhat costly and a time sink. Water waste (and expense). Danger of drowning for young children. A paving stone base would be rife for difficulties with settling etc possibly causing damage to the hot tub and/or messing up the paving stones. The moveable, inflatable types might be a bit better? I don’t really know.
Just my 2 cents worth
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