1/f noise does not truly kill averaging, observe how for increasing f, the noise spectrum looks "white" locally, but with a decreasing noise power for ever high

1/f noise does not truly kill averaging, observe how for increasing f, the noise spectrum looks "white" locally, but with a decreasing noise power for ever higher frequencies. the 1/f noise at significant power levels is restricted to the lower and lower frequencies, effectively a slowly varying reference ("0") voltage of the amplifier, measuring ADC ground every other sample effectively recalibrates the offset voltage of the amplifier, think of "correlated double sampling". Effectively measuring in sequence 0V, signal, 0V, signal, ... moves the signal of interest to a higher frequency band, where the 1/f noise is more tame. When a cliff blocks the way of a vehicle, we don't say "cliffs kill vehicle travel", insteas we just drive around it...