I guess it depends where you place the pot, for example imagine you have a non inverting amplifier, if you place the pot in place of a feedback resistor then gain is directly proportional to the resistance of the pot, a linear pot will give a linear gain change, however if you place the pot in another place, for example in series with the resistance going to ground, gain is proportional to the inverse of the resistance, and if you plot in a graph, you'll notice that gain will not change linearly, so a linear pot will not be the best choice. So in the end it depends on how the pot is being used, for example in an instrumentation amplifier, gain is inversely proportional to the gain resistor, such is the case of the THAT1510/1512 or the INA217, and thats why it is recommended to use a reverse log pot in that case.