Noise figure of Microwave radio receiver
Through a receiver signal chain, dynamic range is a more important measure than noise figure. The dynamic range is the difference between some overload measure, like clipping or a distortion figure, and the noise figure. If there is sufficient dynamic range, then the signal level can be chosen to sit well within that, above the noise level of the component. If the dynamic range is not sufficient, then a good noise figure alone cannot help.

This doesn't hold at the very first component in the receiver after the antenna. Here the signal level cannot be chosen, it is what ever is received. This is why the Low Noise Amplifier (LNA) is specified by noise figure as well as by dynamic range.

It turns out that in practice, the dynamic range of a good ADC can easily exceed that of amplifiers. You might spend more (money, or watts, or PCB real estate) on the amplifier that boosts the signal level from your IF strip's -20dBm to the one volt or so needed by the ADC, to match its dynamic range.