I also think this is flawed. Wind and orchestral string players (violin, cello etc) must develop a fine ear for pitch/intonation, pianists usually aren't given

I also think this is flawed. Wind and orchestral string players (violin, cello etc) must develop a fine ear for pitch/intonation, pianists usually aren't given any choice as to tuning/voicing/regulation of the instruments they have to perform on and I think over time, many lose sensitivity to non Pythagorean intervals and ET deviations from just intonation. So everybody's lumped together, those that play one instrument vs those than are proficient on 3 or more