Actually, I would argue that you do need precision temperature control in some cases, to achieve desired effects. It's the temperature accuracy that doesn't need to be as spot on, imo.
Accuracy is how close your measurements are to the real value, while precision is the repeatability of those measurements.
For our medical users, the repeatability of the temperature to as close as possible could be of value, and serve as a reference point in trying to relieve certain conditions and symptoms, with certain strains. Getting similar ratios of cannabinoids and terpenes could help to find their individual 'sweet spots'.
I agree, it doesn't need to be exact in either accuracy or precision, as we are dealing with ballpark temperatures, and temperature ranges, as has been stated above.