Eli5: why has the sound quality of phone calls improved so little over the last several decades despite us making technological advances in so many areas?
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To be perfectly honest, if you have not noticed the huge improvement over sound quality, you have a hearing issue. Your premice is completely wrong.
the sound capture itself has improved a lot due to active noise canceling; you have one or two microphone capturing your voice, and 1+ capturing the ambiant sound, that is then substracted through complex digital sound processing. The audio codecs used have massively improved in quality, the radios themselves are also better quality so there are less losses, and protocols with more bandwidth can be used.
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