Recently I came across a reputed music-tech teacher who said audio interface manufacturers use A-weighted measurements to show dynamic range in their specs so that they look better on spec sheets and to hide noise in some frequencies. He also said the A-weighted measurements are not used to measure audio interfaces and advised against buying any audio interface that has A-weighted measurements in specifications. Then I was looking at some really high end audio interfaces and noticed they're also displaying their specs in A-weighted measurements.
So what's the real deal about this? Is it fair to say an audio interface is bad just because A-weighted measurements are used in specs?