There is valid use case for when designers simply need "fuzzy logic" or "fuzzy math" which doesn't need exact results, but which can tolerate inaccurate results. If using fuzzy hardware saves resources (time, energy, die space, etc.) then it might be a valid tradeoff to use inaccurate fuzzy hardware instead of exact hardware.

For instance instead of evaluating an exponential function in digital logic, it might be quicker and more energy-efficient to just evaluate it using a diode as an analog voltage, if the value is available as an analog voltage and if some noise is tolerable, as done with analog computers.