Why would you succumb to the fake sound healing narrative? sound can heal, but it’s not linked to the choice of the tuning frequency, but the correlation of pitches to each other. you can choose any starting point. Loved me some 444 tunes.
Standard means that people can play together, though.
The more mind numbing stuff happens with the equal temperament, fixed choice of 12 notes, with no way for some instruments to affect this choice in performance (piano i.e.). This caused more damage to the perception of harmony than anything else (apart from burning you at the stake for tritone usage).
Some frequencies are more equal? Nah…
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