Why do posters keep defining acoustic music as folk music.
C & W was acoustic & is still mainly played on acoustic bodied guitars with pickups rather than solid bodied.
Same with most blues.
My daughter plays cornet in a silver band but has never used amplification.
The content is the definer surely, not what it is played on.
It is difficult enough agreeing what 'folk' is (if we ever can) without bringing method into the equation.
A novice once told me he couldnt see any circumstance where a singer would need a microphone.
I asked him if he thought he could sing at an outdoor concert at Wembley stadium & be heard.
Its a means to an end.
And if it has been recorded (on any medium), on play back it is no longer 'acoustic'.